1. What is the human body’s largest organ?

2. Which type of photoreceptor cells in the human eye are primarily responsible for color vision?

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

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

5. What is the primary biological purpose of the sneezing reflex?

6. How many pairs of 'floating ribs' do humans typically have?

7. If uncoiled, the DNA from all the cells in a single human body would reach approximately how far?

8. Which muscle in the human body is considered the strongest based on its weight and ability to exert force?

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

10. Which tissue connects muscles to bones?

11. What is the primary function of melanin in the human skin?

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

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

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

15. Which antibacterial enzyme is found in human tears and helps protect the eyes from infection?

16. Which of the five senses is the only one that does NOT pass through the thalamus before reaching the cerebral cortex?

17. How thick is the blood-air barrier in the human lungs where gas exchange takes place?

18. What is the anatomical name for the 'white of the eye'?

19. What is the primary function of the gallbladder in the digestive process?

20. What is the primary evolutionary purpose of the human blink reflex triggered by the eyelashes?