2. The colored part of the human eye that controls how much light passes through the pupil is called the?

3. The muscles found in the front of your thighs are known as what?

4. The flow of blood through your heart and around your body is called?

5. How many lungs does the human body have?

6. What is the human body’s biggest organ?

7. How many bones does an adult have? (Approximately)

8. What is the name of the bones that make up your spine?

9. The outside layer of skin on the human body is called the?

10. What does DNA stand for?