Bone Appétit
Gut Instincts
You’ve Got Some Nerve
Go With the Flow
Mind Over Matter
100

Your kneecap’s official name.

What is the patella?

100

This organ stores bile, releasing it when you eat fatty foods.

What is the gallbladder?

100

This protective barrier tightly regulates what substances can enter the brain from the bloodstream.

What is the blood-brain barrier?

100

This chamber of the heart pumps oxygenated blood to the body.

What is the left ventricle?

100

This part of your brain helps keep your balance and coordinate movement.

What is the cerebellum?

200

This bone is the most commonly broken in the human body.

What is the clavicle (collarbone)?

200

The stomach uses this acid to help digest food.

What is hydrochloric acid?

200

This system controls your “fight or flight” responses.

What is the sympathetic nervous system?

200

These blood vessels have valves to prevent backflow.

What are veins?

200

Damage to this lobe can change your personality and decision-making.

What is the frontal lobe?

300

The location of the smallest bones in your body.

What is the middle ear?

300

This gut region houses most of your “good bacteria.” 

What is the large intestine (colon)?

300

This nerve carries signals from the retina to the brain.

What is the optic nerve? 

300

This iron-rich protein binds oxygen in red blood cells.

What is hemoglobin?

300

This region controls automatic functions like breathing and heart rate.

What is the medulla oblongata?

400

This mineral gives bones their hardness and strength.

What is calcium (or hydroxyapatite)?

400

The finger-like projections in the small intestine that absorb nutrients.

What are villi?

400

This long nerve controls your diaphragm and helps you breathe.

What is the phrenic nerve?

400

The pacemaker of the heart.

What is the sinoatrial (SA) node?

400

This neurotransmitter is heavily involved in mood regulation and depression.

What is serotonin?

500

This type of joint, found in your shoulder and hip, allows the greatest range of motion.

What is a ball-and-socket joint?

500

This enzyme in saliva begins breaking down starches.

What is amylase?

500

The “funny bone” feeling comes from this nerve being compressed.

What is the ulnar nerve?

500

This vessel carries oxygen-rich blood from the lungs to the heart — the only one of its kind.

What is the pulmonary vein?

500

The brain’s “pleasure center” pathway is mostly powered by this neurotransmitter.

What is dopamine?