BODY SYSTEMS

4. Study of the structure, function, and pathology of the nervous system.
8. Portion of the central nervous system that is protected by the spinal column.
10. Middle part of the muscle.
11. Whitish bundles of fibers that transmit impulses.
14. Cone-shaped organ that keeps blood moving within the body.
16. Study of the structure, functions, and diseases of the muscular system.
17. Glandlike structures that filter bacteria, viruses, and cancer cells.
21. Type of muscles controlled by the nervous system.
22. Muscle that lifts and turns the head and raises the shoulders
23. Muscle that opens and closes the jaw.
24. Muscles that separate the fingers in the hand.
25. SYSTEM Part of the immune system that helps defend against infection.
26. SYSTEM Body system that includes the brain, spinal chord, and nerves.
29. Lifts the forearm and flexes the elbow.
30. Controls voluntary muscle actions.

1. Chemical substances such as insulin, adrenaline, and estrogen.
2. Tiny blood vessels that bring nutrients to the cells.
3. Muscles that draw the fingers together in the hand.
5. The system that consists of the skin and its accessory organs.
6. Carry blood containing waste to the heart and lungs for cleaning.
7. Movable part of the muscle.
9. Raises the eyebrows
12. Also known as the vascular system.
13. Tubelike structures that circulate blood.
15. Largest artery in the body.
17. Pale-yellow fluid that contains white blood cells.
18. Holds the skeletal system in place.
19. Extends the arm and straightens the elbow.
20. Thick-walled flexible tubes that carry blood away from the heart.
27. Part of the muscle that does not move.
28. Muscle that allows the arm to extend outward and to the side of the body.