From heartbeats to hair follicles, show off your inner genius and prove you're more than just skin deep!
Which organ, containing melanin and millions of nerve endings, is the human body's largest and serves as its primary protective barrier?
Skin
What gas diffuses across the alveoli in your lungs into the bloodstream to power your cells?
Oxygen
Which hormone does your pancreas release after eating pizza, acting like a key to let glucose into your cells?
Insulin
Nearly all human cells—despite having over 200 different shapes and functions—contain identical copies of what genetic material?
DNA
Considering that bones fuse as infants grow, how many bones does the average adult human skeleton have?
206