If You Can Get 15/20 on This Quiz on Your First Try, You Definitely Know a Lot About the Human Body

How many cells are in the human body?

• 15 billion

• 100 billion

• 37 trillion

• 1 trillion

What is another word for the shoulder blade in the human body?

• Humerus

• Phalange

• Scapula

• Femur

What is the proper term for vomiting blood?

• Hemocyanin

• Hematemesis

• Hemocoel

• Hemacytometer

Here's the halfway point! Exposure to sunlight helps a person improve their health because...

• The pigment cells in the skin get stimulated and produce a healthy tan

• The ultraviolet rays convert skin oil into vitamin D

• The infrared light kills bacteria in the body

What is the largest bone in the human body?

• Femur

• Scapula

• Fibula

• Tarsal

What invertebrate was (and still occasionally is) applied to the human body as part of medical treatment for disease?

• Leeches

• Snails

• Sea anemone

• Hook worms

What happens to your brain when you sleep?

• Your mind wanders, free of constraints. It's why dreams can be so strange.

• It slows down so much that your thoughts become barely perceptible.

• Parts of the nervous system switch on, creating a sequence of healing cycles.

• It powers off — you're out like a light.

Last one: what does the endocrine system do in the human body?

• It's made up of nerve cells that transmit electrical signals around the body.

• It's made up of glands that produce and secrete hormones.