1. How many bones are in the adult human body?

2. Which blood type is known as the universal donor?

3. What is the main function of red blood cells?

4. Roughly what is the length of the small intestine in a living adult?

5. What are the microscopic functional units of the kidney called?

6. Where are the muscles that primarily control the movement of your fingers located?

7. Approximately how often does the human body replace its taste buds?

8. Which enzyme in saliva is responsible for beginning the digestion of starches in the mouth?

9. What is the name of the substance that prevents the alveoli from collapsing during exhalation?

10. Which gland is often referred to as the 'master gland' of the endocrine system?

11. What are the clusters of cells in the pancreas that produce insulin called?

12. What specialized structures connect cardiac muscle cells and allow them to contract in sync?

13. What happens to the diaphragm when you inhale air into your lungs?

14. How does the cornea receive oxygen since it contains no blood vessels?

15. What are the microscopic hair-like structures that move mucus out of the human respiratory tract called?

16. Which part of the inner ear contains the hair cells that convert mechanical vibrations into electrical signals?

17. Which cranial nerve is the primary component of the parasympathetic nervous system?

18. What is the name of the main artery that carries oxygenated blood away from the heart to the rest of the body?

19. How often does the human body replace the entire lining of the stomach?

20. What is the term for the body's ability to sense its own position and movement without using sight?