Collection · COL-03

Inside the Body

Cells, organelles, bacteria-eating immune cells, the things floating in your eyes, blood moving through living vessels, veins sealed shut from the inside, red cells bent into sickles, heart pumps that work from outside a child's chest, lungs that give way to sudden pressure and the scanners that image you.

Emotions, mood and brain chemistry now have their own collection, COL-13 The Brain.

27 case files · 54 quiz questions · Science, Nature, People, Tech, Dark Facts

27 case files in this collection

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Free PDF: every quick fact with its ID, the write-ups, sources and a quiz with an answer key.

What Is in Inside the Body?

27 case files on what is working, floating and hiding inside you. Eukaryotic cells contain specialized organelles, each with its own job. DD-003 Vaults are hollow, barrel-shaped particles in most of our cells (about 10,000 per cell), each built from 78 copies of one protein, and nobody knows for sure what they do. DD-015

The Case Files, in Order

  1. 01
    DID YOU
    KNOW?    EukaryoticDD-003

    DD-003Science+ Nature

    Eukaryotic

    Your cells are packed with tiny organs.

    Open case file →
  2. 02
    DID YOU
    KNOW?    The VaultDD-015

    DD-015Science+ Nature

    The Vault

    Your cells are full of hollow barrels called vaults.

    Open case file →
  3. 03
    DID YOU
    KNOW?    Starry EyedDD-001

    DD-001People+ Science

    Starry Eyed

    Some people have tiny stars floating in their eyes.

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  4. 04
    DID YOU
    KNOW?    MacrophagiaDD-044

    DD-044Science

    Macrophagia

    Some of your cells eat bacteria whole.

    Open case file →
  5. 05
    DID YOU
    KNOW?    Blood WatchDD-649

    DD-649Science+ Tech

    Blood Watch

    Watching blood flow live.

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  6. 06
    DID YOU
    KNOW?    SclerotherapyDD-597

    DD-597Science+ People

    Sclerotherapy

    Closing veins from the inside.

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  7. 07
    DID YOU
    KNOW?    Sickled CellsDD-613

    DD-613Science+ Nature

    Sickled Cells

    One swapped amino acid, one bent cell.

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  8. 08
    DID YOU
    KNOW?    Berlin HeartDD-577

    DD-577Science+ Tech

    Berlin Heart

    A child's heart pump, outside the body.

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  9. 09
    DID YOU
    KNOW?    ImploderDD-593

    DD-593Science+ Dark Facts

    Imploder

    Air spaces are the body's weak point.

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  10. 10
    DID YOU
    KNOW?    An MRI's SkeletonDD-290

    DD-290Science+ Tech

    An MRI's Skeleton

    Strip the covers off a scanner and the ring starts spinning.

    Open case file →
  11. 11
    DID YOU
    KNOW?    I Wanted You to Know...DD-265

    DD-265Science+ People

    I Wanted You to Know...

    Every heartbeat starts with a spark from the sinoatrial node.

    Open case file →
  12. 12
    DID YOU
    KNOW?    Bacteria HuntersDD-309

    DD-309Science+ Nature

    Bacteria Hunters

    Phages are the most numerous biological entities on Earth, yet the idea of using them as medicine was largely sidelined in the West by antibiotics; rising antibiotic resistance is why that century-old idea is back.

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  13. 13
    DID YOU
    KNOW?    Your Heart in a GlassDD-315

    DD-315Science+ People

    Your Heart in a Glass

    Heart muscle cells can beat on their own in a dish.

    Open case file →
  14. 14
    DID YOU
    KNOW?    Embryonic DevelopmentDD-333

    DD-333Science+ People

    Embryonic Development

    The earliest stage of an embryo involves a lot of division with no growth at all, and the real reorganization comes later, when cells sort themselves into layers.

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  15. 15
    DID YOU
    KNOW?    Blood DestructionDD-395

    DD-395Science

    Blood Destruction

    Malaria remains one of the deadliest infectious diseases, concentrated overwhelmingly in Africa, and its long fight with humans has reshaped both medicine and the human genome.

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  16. 16
    DID YOU
    KNOW?    Articulated ProsthesisDD-438

    DD-438Science+ Tech

    Articulated Prosthesis

    Myoelectric hands read electrical signals from the user's muscles.

    Open case file →
  17. 17
    DID YOU
    KNOW?    Rabies CraziesDD-420

    DD-420Science+ Nature

    Rabies Crazies

    Rabies travels along nerves from a bite to the brain.

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  18. 18
    DID YOU
    KNOW?    Root of the ProblemDD-448

    DD-448Science

    Root of the Problem

    A root canal removes infected pulp to save a tooth.

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  19. 19
    DID YOU
    KNOW?    Seeing Things DifferentlyDD-454

    DD-454Science

    Seeing Things Differently

    Laser eye surgery reshapes the cornea to fix blurry vision.

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  20. 20
    DID YOU
    KNOW?    Face CreatorDD-465

    DD-465Science

    Face Creator

    The human face starts as separate pieces that grow together.

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  21. 21
    DID YOU
    KNOW?    MAiDDD-487

    DD-487People

    MAiD

    Some countries let eligible patients get medical help to end their lives.

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  22. 22
    DID YOU
    KNOW?    Lens CrafterDD-492

    DD-492Tech

    Lens Crafter

    Many contact lenses are cast in molds; custom ones are cut on a lathe.

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  23. 23
    DID YOU
    KNOW?    Shifty PeripheryDD-502

    DD-502Science

    Shifty Periphery

    You often notice movement out of the corner of your eye first.

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  24. 24
    DID YOU
    KNOW?    Cell DeathDD-523

    DD-523Science

    Cell Death

    Your cells are built to self-destruct when needed.

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  25. 25
    DID YOU
    KNOW?    Wet ResponseDD-525

    DD-525Science

    Wet Response

    Pruney fingers are your nervous system at work.

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  26. 26
    DID YOU
    KNOW?    HHSDD-539

    DD-539People

    HHS

    HHS runs Medicare, Medicaid and oversees the CDC, FDA and NIH.

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  27. 27
    DID YOU
    KNOW?    AI Surgery IIDD-549

    DD-549Tech+ Science

    AI Surgery II

    Robotic microsurgery systems filter out a surgeon's hand tremor.

    Open case file →

Collection Quiz

All quizzes →

54 questions from all 27 case files in Inside the Body. Test Your Knowledge: answers are revealed instantly.

  1. Which organelle holds the cell's DNA and controls gene expression?

    1. Golgi apparatus
    2. Ribosome
    3. Nucleus
    4. Lysosome
    Show the answer

    Answer: C. Nucleus Now You Know: The nucleus holds the cell's DNA and controls gene expression. Source: DD-003 · Eukaryotic · Write-up · Exhibit A (Nucleus), from the Reel

  2. Which organelles produce energy through cellular respiration?

    1. Mitochondria
    2. Peroxisomes
    3. Ribosomes
    4. Golgi apparatus
    Show the answer

    Answer: A. Mitochondria Now You Know: Mitochondria produce the cell's energy through cellular respiration. Source: DD-003 · Eukaryotic · Write-up · Exhibit D (Mitochondria), from the Reel

  3. Why are vaults called 'vaults'?

    1. They lock away the cell's DNA
    2. Under the microscope they look like the arches of a cathedral's vaulted ceiling
    3. They were found inside bank-vault-like membranes
    4. They store the cell's energy reserves
    Show the answer

    Answer: B. Under the microscope they look like the arches of a cathedral's vaulted ceiling Now You Know: Kedersha and Rome named them for their resemblance to the multiple arches of cathedral vaults. Source: DD-015 · The Vault · Write-up · Exhibit A (Found by accident in 1986) · Isolation and characterization of a novel ribonucleoprotein particle (Kedersha & Rome, J. Cell Biol. 1986); The key to 'the vault' (California NanoSystems Institute, UCLA, May 27, 2024)

  4. Roughly how many vaults does a typical human cell contain?

    1. About 10
    2. About 10,000
    3. About 10 million
    4. Exactly one
    Show the answer

    Answer: B. About 10,000 Now You Know: Most human cells have around 10,000 vaults; some immune cells may have up to 100,000. Source: DD-015 · The Vault · Write-up · Exhibit B (Big and everywhere) · Isolation and characterization of a novel ribonucleoprotein particle (Kedersha & Rome, J. Cell Biol. 1986); The vault complex (van Zon et al., Cell Mol Life Sci 2003, via PMC); How a scientist's lifelong obsession with vaults could transform medicine (UCLA Health)

  5. Where in the eye are asteroid bodies found?

    1. The cornea
    2. The lens
    3. The vitreous gel
    4. The tear film
    Show the answer

    Answer: C. The vitreous gel Now You Know: They sit in the vitreous humor, the gel that fills the eyeball. Source: DD-001 · Starry Eyed · Write-up · Exhibit A (Stars in the vitreous) · Prevalence and associations of asteroid hyalosis: the Beijing Eye Study (BMC Ophthalmology, 2022); Asteroid Hyalosis (EyeWiki, American Academy of Ophthalmology)

  6. What are asteroid bodies mainly made of?

    1. Iron and protein
    2. Calcium, phosphate and lipids
    3. Ice crystals
    4. Cholesterol only
    Show the answer

    Answer: B. Calcium, phosphate and lipids Now You Know: They're lipids complexed with calcium, phosphate and oxygen, with an apatite-like structure. Source: DD-001 · Starry Eyed · Write-up · Exhibit B (What they're made of) · Ultrastructure and composition of asteroid bodies (Winkler & Lünsdorf, IOVS 2001; PubMed); Global prevalence of asteroid hyalosis: systematic review and meta-analysis (Acta Ophthalmologica, 2020); Prevalence and associations of asteroid hyalosis: the Beijing Eye Study (BMC Ophthalmology, 2022)

  7. What does 'macrophage' mean?

    1. Small cell
    2. Big eater
    3. White blood
    4. Fast mover
    Show the answer

    Answer: B. Big eater Now You Know: From the Greek makros (big) and phagein (to eat). Source: DD-044 · Macrophagia · Write-up · Exhibit A (Big eaters) · Origins, Biology, and Diseases of Tissue Macrophages (PMC)

  8. What are antibodies and complement proteins that tag a microbe for eating called?

    1. Opsonins
    2. Lysosomes
    3. Ribosomes
    4. Hormones
    Show the answer

    Answer: A. Opsonins Now You Know: Opsonic receptors bind these tags. Source: DD-044 · Macrophagia · Write-up · Exhibit B (Two ways to spot a target) · Uribe-Querol & Rosales, Control of Phagocytosis by Microbial Pathogens (Frontiers in Immunology, 2017); Uribe-Querol & Rosales, Phagocytosis: Our Current Understanding of a Universal Biological Process (Frontiers in Immunology, 2020); Phagocytosis (StatPearls, NCBI Bookshelf)

  9. Who described capillaries in 1661?

    1. Marcello Malpighi
    2. Louis Pasteur
    3. Robert Koch
    4. Marie Curie
    Show the answer

    Answer: A. Marcello Malpighi Now You Know: He looked at a frog's lung. Source: DD-649 · Blood Watch · Write-up · Exhibit A (Malpighi's capillaries) · Hwa & Aird (2007): The history of the capillary wall, doctors, discoveries, and debates, American Journal of Physiology

  10. What did Rudolph Wagner see in 1839?

    1. White blood cells rolling along vessel walls
    2. The first virus
    3. DNA
    4. A heart transplant
    Show the answer

    Answer: A. White blood cells rolling along vessel walls Now You Know: In a frog's webbed foot. Source: DD-649 · Blood Watch · Write-up · Exhibit B (Rolling white cells) · Granger & Senchenkova: Inflammation and the Microcirculation, Historical Perspectives (NCBI Bookshelf); Intravital microscopy in historic and contemporary immunology, Immunology & Cell Biology (PMC)

  11. What does a sclerosant damage?

    1. The vein's inner lining
    2. The skin's surface
    3. The bone
    4. The nerve
    Show the answer

    Answer: A. The vein's inner lining Now You Know: The endothelium. Source: DD-597 · Sclerotherapy · Write-up · Exhibit A (Damage on purpose) · StatPearls (NCBI Bookshelf): Sclerotherapy; DermNet: Sclerotherapy

  12. What kind of agent is polidocanol?

    1. A detergent
    2. An antibiotic
    3. A painkiller
    4. A vitamin
    Show the answer

    Answer: A. A detergent Now You Know: It breaks down the lining's cell membranes. Source: DD-597 · Sclerotherapy · Write-up · Exhibit B (Detergents lead) · StatPearls (NCBI Bookshelf): Sclerotherapy; Sclerotherapy for lower limb telangiectasias, Cochrane review (PMC)

  13. What is the abnormal hemoglobin in sickle cell disease called?

    1. Hemoglobin S
    2. Hemoglobin A
    3. Hemoglobin F
    4. Hemoglobin C
    Show the answer

    Answer: A. Hemoglobin S Now You Know: It forms rigid strands. Source: DD-613 · Sickled Cells · Write-up · Exhibit A (One swap) · Sundd, Gladwin & Novelli (2019), Pathophysiology of Sickle Cell Disease, Annual Review of Pathology; Wikipedia: Sickle cell disease

  14. When does hemoglobin S form rigid strands?

    1. After it releases oxygen
    2. Only in the lungs
    3. When it's cold
    4. After eating
    Show the answer

    Answer: A. After it releases oxygen Now You Know: In the tissues, where oxygen is delivered. Source: DD-613 · Sickled Cells · Write-up · Exhibit A (One swap) · Sundd, Gladwin & Novelli (2019), Pathophysiology of Sickle Cell Disease, Annual Review of Pathology; Wikipedia: Sickle cell disease

  15. Where do the EXCOR's blood pumps sit?

    1. Outside the body
    2. Inside the chest
    3. In the abdomen
    4. Inside the heart
    Show the answer

    Answer: A. Outside the body Now You Know: That's what paracorporeal means. Source: DD-577 · Berlin Heart · Write-up · Exhibit A (Pumps outside the body) · FDA: HDE approval letter and summary, Berlin Heart EXCOR Pediatric VAD (H100004), December 16, 2011

  16. What drives the EXCOR's pumps?

    1. Air pressure
    2. Magnets
    3. A hand crank
    4. Springs
    Show the answer

    Answer: A. Air pressure Now You Know: Air pulses flex a membrane in each pump. Source: DD-577 · Berlin Heart · Write-up · Exhibit B (Driven by air) · FDA: HDE approval letter and summary, Berlin Heart EXCOR Pediatric VAD (H100004), December 16, 2011

  17. Why doesn't slowly rising pressure crush a diver?

    1. The body is mostly water, which barely compresses
    2. Wetsuits hold back the pressure
    3. Pressure doesn't rise underwater
    4. Divers hold their breath
    Show the answer

    Answer: A. The body is mostly water, which barely compresses Now You Know: The danger is in sudden changes and air spaces. Source: DD-593 · Imploder · Write-up · Exhibit A (Water doesn't squeeze) · NOAA National Ocean Service: How does pressure change with ocean depth?; Wikipedia: Blast injury

  18. Which parts of the body are most vulnerable to pressure injury?

    1. Air-filled spaces like the lungs
    2. Bones
    3. Fingernails
    4. Hair
    Show the answer

    Answer: A. Air-filled spaces like the lungs Now You Know: This is called barotrauma. Source: DD-593 · Imploder · Write-up · Exhibit B (Air is the weak point) · Wikipedia: Blast injury

  19. What does MRI use to image the body?

    1. A strong magnet and radio waves
    2. X-rays
    3. Ultrasound
    4. Visible light
    Show the answer

    Answer: A. A strong magnet and radio waves Now You Know: The signals come from hydrogen nuclei. Source: DD-290 · An MRI's Skeleton · Write-up · Exhibit A (Magnets and radio) · NIBIB (NIH): Magnetic Resonance Imaging (MRI)

  20. Do MRI gradient coils spin?

    1. No, they're stationary
    2. Yes, rapidly
    3. Only during startup
    4. Only in old models
    Show the answer

    Answer: A. No, they're stationary Now You Know: They vary the field electrically. Source: DD-290 · An MRI's Skeleton · Write-up · Exhibit B (Gradient coils) · NIBIB (NIH): Magnetic Resonance Imaging (MRI)

  21. What is the heart's natural pacemaker?

    1. The sinoatrial node
    2. The aorta
    3. The lungs
    4. The bundle of His
    Show the answer

    Answer: A. The sinoatrial node Now You Know: It fires the first impulse. Source: DD-265 · I Wanted You to Know... · Write-up · Exhibit A (Pacemaker) · Wikipedia: Cardiac cycle; Wikipedia: Sinoatrial node

  22. Which chambers contract first?

    1. The atria
    2. The ventricles
    3. The lungs
    4. The valves
    Show the answer

    Answer: A. The atria Now You Know: Then the ventricles. Source: DD-265 · I Wanted You to Know... · Write-up · Exhibit B (Atria first) · Wikipedia: Cardiac cycle

  23. What do phages infect?

    1. Bacteria
    2. Humans
    3. Plants only
    4. Rocks
    Show the answer

    Answer: A. Bacteria Now You Know: Only bacteria. Source: DD-309 · Bacteria Hunters · Write-up · Exhibit A (Outnumbering all life) · Wikipedia: Bacteriophage

  24. What do they inject?

    1. Genetic material
    2. Oxygen
    3. Sugar
    4. Water
    Show the answer

    Answer: A. Genetic material Now You Know: DNA or RNA. Source: DD-309 · Bacteria Hunters · Write-up · Exhibit A (Outnumbering all life) · Wikipedia: Bacteriophage

  25. What are heart muscle cells called?

    1. Cardiomyocytes
    2. Neurons
    3. Erythrocytes
    4. Osteocytes
    Show the answer

    Answer: A. Cardiomyocytes Now You Know: Cardiac cells. Source: DD-315 · Your Heart in a Glass · Write-up · Exhibit A (Cardiomyocytes) · Wikipedia: Cardiac muscle cell

  26. Which proteins contract?

    1. Actin and myosin
    2. Keratin
    3. Collagen
    4. Insulin
    Show the answer

    Answer: A. Actin and myosin Now You Know: In myofibrils. Source: DD-315 · Your Heart in a Glass · Write-up · Exhibit B (Impulses) · Wikipedia: Cardiac muscle cell

  27. What is the first cell?

    1. A zygote
    2. A neuron
    3. A blastocyst
    4. A gamete
    Show the answer

    Answer: A. A zygote Now You Know: Fertilized. Source: DD-333 · Embryonic Development · Write-up · Exhibit A (Dividing without growing) · Wikipedia: Embryonic development

  28. What are early divisions called?

    1. Cleavage
    2. Mitosis only
    3. Meiosis
    4. Fusion
    Show the answer

    Answer: A. Cleavage Now You Know: Rapid. Source: DD-333 · Embryonic Development · Write-up · Exhibit A (Dividing without growing) · Wikipedia: Cleavage (embryo)

  29. What causes malaria?

    1. Plasmodium parasites
    2. A virus
    3. Bacteria
    4. Fungi
    Show the answer

    Answer: A. Plasmodium parasites Now You Know: Protozoa. Source: DD-395 · Blood Destruction · Write-up · Exhibit A (The current toll) · Wikipedia: Malaria

  30. Which mosquitoes spread it?

    1. Female Anopheles
    2. Male Aedes
    3. All flies
    4. Ticks
    Show the answer

    Answer: A. Female Anopheles Now You Know: Vector. Source: DD-395 · Blood Destruction · Write-up · Exhibit B (Nobel-winning detective work) · Wikipedia: Malaria

  31. What controls a myoelectric hand?

    1. Muscle signals
    2. Voice
    3. Eye blinks
    4. Breath
    Show the answer

    Answer: A. Muscle signals Now You Know: Electrodes. Source: DD-438 · Articulated Prosthesis · Write-up · Exhibit A (Joints) · Wikipedia: Prosthesis

  32. Where are sensors placed?

    1. On the skin
    2. In the bone
    3. On the shoe
    4. In the mouth
    Show the answer

    Answer: A. On the skin Now You Know: Residual limb. Source: DD-438 · Articulated Prosthesis · Write-up · Exhibit B (Myoelectric) · Wikipedia: Myoelectric prosthesis

  33. How does rabies spread?

    1. Bites or scratches
    2. Air
    3. Water
    4. Food
    Show the answer

    Answer: A. Bites or scratches Now You Know: Saliva. Source: DD-420 · Rabies Crazies · Write-up · Exhibit A (Spread) · Wikipedia: Rabies

  34. How does it reach the brain?

    1. Along nerves
    2. Through blood only
    3. Via lungs
    4. Through skin
    Show the answer

    Answer: A. Along nerves Now You Know: Peripheral nerves. Source: DD-420 · Rabies Crazies · Write-up · Exhibit B (Route) · Wikipedia: Rabies

  35. What is removed?

    1. The pulp
    2. The enamel
    3. The gum
    4. The jaw
    Show the answer

    Answer: A. The pulp Now You Know: Soft tissue. Source: DD-448 · Root of the Problem · Write-up · Exhibit A (Pulp) · Wikipedia: Root canal treatment

  36. What fills the canals?

    1. Gutta-percha
    2. Gold
    3. Cement only
    4. Wax
    Show the answer

    Answer: A. Gutta-percha Now You Know: Rubbery. Source: DD-448 · Root of the Problem · Write-up · Exhibit B (Removal) · Wikipedia: Root canal treatment

  37. What is reshaped?

    1. Cornea
    2. Retina
    3. Lens
    4. Iris
    Show the answer

    Answer: A. Cornea Now You Know: Front of eye. Source: DD-454 · Seeing Things Differently · Write-up · Exhibit A (Goal) · Wikipedia: LASIK

  38. LASIK stands for laser-assisted in situ...?

    1. Keratomileusis
    2. Keratitis
    3. Myopia
    4. Lenticule
    Show the answer

    Answer: A. Keratomileusis Now You Know: Term. Source: DD-454 · Seeing Things Differently · Write-up · Exhibit B (Target) · Wikipedia: LASIK

  39. Which cells migrate?

    1. Neural crest
    2. Red blood
    3. Muscle
    4. Fat
    Show the answer

    Answer: A. Neural crest Now You Know: Embryo. Source: DD-465 · Face Creator · Write-up · Exhibit A (Start) · Wikipedia: Human embryonic development

  40. How many segments?

    1. Five
    2. Two
    3. Ten
    4. One
    Show the answer

    Answer: A. Five Now You Know: Prominences. Source: DD-465 · Face Creator · Write-up · Exhibit B (Cells) · Wikipedia: Human embryonic development

  41. MAiD stands for?

    1. Medical assistance in dying
    2. Medical aid insurance deal
    3. Mandatory aid
    4. None
    Show the answer

    Answer: A. Medical assistance in dying Now You Know: Term. Source: DD-487 · MAiD · Write-up · Exhibit A (Term) · Wikipedia: Medical assistance in dying

  42. Country using the term?

    1. Canada
    2. Japan
    3. Brazil
    4. Egypt
    Show the answer

    Answer: A. Canada Now You Know: Canada. Source: DD-487 · MAiD · Write-up · Exhibit B (Legal in) · Wikipedia: Medical assistance in dying

  43. RGP means?

    1. Rigid gas permeable
    2. Really good plastic
    3. Red glass pane
    4. None
    Show the answer

    Answer: A. Rigid gas permeable Now You Know: Type. Source: DD-492 · Lens Crafter · Write-up · Exhibit A (Methods) · Wikipedia: Contact lens

  44. Custom lenses are often?

    1. Lathed
    2. Painted
    3. Blown
    4. Woven
    Show the answer

    Answer: A. Lathed Now You Know: Machined. Source: DD-492 · Lens Crafter · Write-up · Exhibit B (RGP) · Wikipedia: Contact lens

  45. Which cells dominate the periphery?

    1. Rods
    2. Cones
    3. Neurons only
    4. Lens cells
    Show the answer

    Answer: A. Rods Now You Know: Light-sensitive. Source: DD-502 · Shifty Periphery · Write-up · Exhibit A (Strength) · Wikipedia: Rod cell

  46. Center of retina has?

    1. Cones
    2. Only rods
    3. No cells
    4. Blood
    Show the answer

    Answer: A. Cones Now You Know: Fovea. Source: DD-502 · Shifty Periphery · Write-up · Exhibit B (Cells) · Wikipedia: Rod cell

  47. Programmed cell death?

    1. Apoptosis
    2. Necrosis
    3. Mitosis
    4. Osmosis
    Show the answer

    Answer: A. Apoptosis Now You Know: Controlled. Source: DD-523 · Cell Death · Write-up · Exhibit A (Type) · Wikipedia: Apoptosis

  48. Key enzymes?

    1. Caspases
    2. Amylases
    3. Lipases
    4. Kinases only
    Show the answer

    Answer: A. Caspases Now You Know: Dismantlers. Source: DD-523 · Cell Death · Write-up · Exhibit B (Contrast) · Wikipedia: Apoptosis

  49. Controlled by?

    1. Autonomic nervous system
    2. Bones
    3. Muscles only
    4. Hair
    Show the answer

    Answer: A. Autonomic nervous system Now You Know: Automatic. Source: DD-525 · Wet Response · Write-up · Exhibit A (Cause) · Wikipedia: Wrinkle

  50. What constricts?

    1. Blood vessels
    2. Bones
    3. Nails
    4. Hair
    Show the answer

    Answer: A. Blood vessels Now You Know: Volume. Source: DD-525 · Wet Response · Write-up · Exhibit B (Control) · Wikipedia: Wrinkle

  51. Program it runs?

    1. Medicare
    2. Social Security
    3. NASA
    4. Amtrak
    Show the answer

    Answer: A. Medicare Now You Know: Health. Source: DD-539 · HHS · Write-up · Exhibit A (Role) · Wikipedia: United States Department of Health and Human Services

  52. Agency it oversees?

    1. CDC
    2. FBI
    3. EPA
    4. IRS
    Show the answer

    Answer: A. CDC Now You Know: Public health. Source: DD-539 · HHS · Write-up · Exhibit B (Origin) · Wikipedia: United States Department of Health and Human Services

  53. What is filtered?

    1. Tremor
    2. Light
    3. Sound
    4. Blood
    Show the answer

    Answer: A. Tremor Now You Know: Steadiness. Source: DD-549 · AI Surgery II · Write-up · Exhibit A (Scale) · Wikipedia: Robot-assisted surgery

  54. Motion scaling does?

    1. Shrinks movements
    2. Speeds them
    3. Stops them
    4. Records them
    Show the answer

    Answer: A. Shrinks movements Now You Know: Precision. Source: DD-549 · AI Surgery II · Write-up · Exhibit B (Imaging) · Wikipedia: Robot-assisted surgery