1. What is the largest internal organ in the human body?

2. What is the rarest blood type?

3. Approximately how many miles of blood vessels are found in a single human adult?

4. What percentage of the body's total energy consumption is used by the brain?

5. Where in the human body is the smallest bone (the stapes) located?

6. Which type of sweat gland is found all over the body and is primarily responsible for temperature regulation?

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

8. Where is the vestibular system, which controls balance and spatial orientation, located?

9. What is the biological term for a bone that is embedded within a tendon, like the kneecap?

10. Which blood type is considered the 'universal donor' because it can be safely given to almost any patient?

11. From which parent do humans inherit nearly all of their mitochondrial DNA?

12. What is the name of the active growth phase of a hair follicle?

13. Which vitamin is essential for the production of blood clotting factors in the liver?

14. What is the primary function of red bone marrow in the human body?

15. What is the name of the fluid that lubricates and reduces friction in human joints?

16. What is the name of the lining of the uterus that is shed during menstruation?

17. Where in the human body are the menisci located?

18. Which hormone, produced by the kidneys, stimulates the production of red blood cells?

19. Which bone in the human body is unique because it does not connect to any other bone?

20. What is the name of the tough, fibrous membrane that covers the outside of a bone?