Body Systems

4. Air enters the respiratory system through the nose or ________.
6. A group of hard organs found in the oral cavity.
9. a short loop from the heart to the lungs and back again.
10. sends blood throughout our bodies, carrying oxygen to every cell.
12. It supports the upper body’s weight; provides posture while allowing for movement and flexibility; and protects the spinal cord.
13. The network of nerve cells and fibers which transmits nerve impulses between parts of the body.
15. The brain and the spinal cord.
17. underneath the middle of the forebrain, acts as a master coordinator for all the messages going in and out of the brain to the spinal cord.
18. Is controlled by a system of electrical signals in the heart.
19. The muscular system’s main function.
20. Allows us to breathe.
21. Lines the inside of blood vessels and organs, such as the stomach, and is also known as visceral muscle.

1. An organ system consisting of skeletal, smooth and cardiac muscles.
2. The only muscles that can be consciously controlled.
3. Protects the all-important brain and supports the other soft tissues of the head.
5. An organ system that permits blood to circulate and transport nutrients, oxygen, carbon dioxide, blood cells, etc.
7. Hollow areas between the bones in your head that help regulate the temperature and humidity of the air you inhale.
8. The largest and most complex part of the brain.
11. Provides the structural support for the human body and protects our organs.
14. Two organs that remove oxygen from the air and pass it into your blood.
15. Located only in the heart.
16. Carries blood from the heart to all the other parts of the body and back again.