Body systems

1. the network of nerve cells and fibers which transmits nerve impulses between parts of the body
3. Air-sacs in lungs where O2 and CO2 exchange take place
8. The process by which bones form
11. two superior chambers of the heart, serve as receiving chambers
14. The muscular system’s main function is to allow movement. When muscles contract, they contribute to gross and fine movement.
15. an organ system consisting of skeletal, smooth and cardiac muscles. It permits movement of the body, maintains posture and circulates blood throughout the body
16. A muscle movement under conscious control (e.g. deciding to move the forearm).
17. flap of cartilage that prevents food or liquid from entering trachea
18. connects the brain to the spinal cord
20. the cells that help develop a new bone

2. your body's central framework. It consists of bones and connective tissue, including cartilage, tendons, and ligaments.
4. A muscle movement not under conscious control (e.g. the beating of the heart).
5. a biological system consisting of specific organs and structures used for gas exchange in animals and plants.
6. The large trunk artery that carries blood from the left ventricle of the heart to branch arteries
7. the major "highway" connecting the brain and the peripheral nervous system
9. End of trachea divided into right and left sides
10. an organ system that permits blood to circulate and transport nutrients
12. The end of bones
13. vessels that carry blood to heart from the venules
19. the small space between neurons across which an impulse must move