Human Systems

2. a network of hormone production that work together to create life.
4. includes the brain, spinal cord, and a complex network of nerves.
7. composed of specialized cells called muscle fibers.
10. protects your body from harmful substances, and germs.
11. The process by which a single parent cell divides to make two new daughter cells.
15. where your body breaks down food and absorbs nutrients.
17. made up of glands that make hormones.
19. your body's outer layer.
20. chromosomes move from the center toward the opposite ends of a dividing cell.
21. a system that removes excess and waste products from the body to maintain homeostasis.
22. chemicals that affect growth a d development.

1. type of cell division during which a single cell divides twice and produces four daughter cells.
3. the organ in your chest that pumps the blood around your body.
5. made up of blood vessels that carry blood away from and towards the heart.
6. made of connective tissue reinforced with calcium.
8. One of a pair of bones at the base of the front of the neck.
9. muscle that is common in the walls of hollow organs and blood vessels.
12. gives your body its shape, allows movement, makes blood cells.
13. One of a pair of organs in the abdomen.
14. takes up oxygen from the air we breathe.
16. strong, flexible connective tissue that protects your joints and bones.
18. chromosomes move in opposite directions so two new cells can be formed from one.