Your kneecap’s official name.
What is the patella?
This organ stores bile, releasing it when you eat fatty foods.
What is the gallbladder?
This protective barrier tightly regulates what substances can enter the brain from the bloodstream.
What is the blood-brain barrier?
This chamber of the heart pumps oxygenated blood to the body.
What is the left ventricle?
This part of your brain helps keep your balance and coordinate movement.
What is the cerebellum?
This bone is the most commonly broken in the human body.
What is the clavicle (collarbone)?
The stomach uses this acid to help digest food.
What is hydrochloric acid?
This system controls your “fight or flight” responses.
What is the sympathetic nervous system?
These blood vessels have valves to prevent backflow.
What are veins?
Damage to this lobe can change your personality and decision-making.
What is the frontal lobe?
The location of the smallest bones in your body.
What is the middle ear?
This gut region houses most of your “good bacteria.”
What is the large intestine (colon)?
This nerve carries signals from the retina to the brain.
What is the optic nerve?
This iron-rich protein binds oxygen in red blood cells.
What is hemoglobin?
This region controls automatic functions like breathing and heart rate.
What is the medulla oblongata?
This mineral gives bones their hardness and strength.
What is calcium (or hydroxyapatite)?
The finger-like projections in the small intestine that absorb nutrients.
What are villi?
This long nerve controls your diaphragm and helps you breathe.
What is the phrenic nerve?
The pacemaker of the heart.
What is the sinoatrial (SA) node?
This neurotransmitter is heavily involved in mood regulation and depression.
What is serotonin?
This type of joint, found in your shoulder and hip, allows the greatest range of motion.
What is a ball-and-socket joint?
This enzyme in saliva begins breaking down starches.
What is amylase?
The “funny bone” feeling comes from this nerve being compressed.
What is the ulnar nerve?
This vessel carries oxygen-rich blood from the lungs to the heart — the only one of its kind.
What is the pulmonary vein?
The brain’s “pleasure center” pathway is mostly powered by this neurotransmitter.
What is dopamine?