Human Systems

2. chemicals that affect growth a d development.
5. muscle that is common in the walls of hollow organs and blood vessels.
7. chromosomes move from the center toward the opposite ends of a dividing cell.
11. gives your body its shape, allows movement, makes blood cells.
12. takes up oxygen from the air we breathe.
14. where your body breaks down food and absorbs nutrients.
16. chromosomes move in opposite directions so two new cells can be formed from one.
17. the organ in your chest that pumps the blood around your body.
18. One of a pair of organs in the abdomen.
19. protects your body from harmful substances, and germs.
20. The process by which a single parent cell divides to make two new daughter cells.
21. strong, flexible connective tissue that protects your joints and bones.

1. made up of blood vessels that carry blood away from and towards the heart.
3. composed of specialized cells called muscle fibers.
4. made up of glands that make hormones.
6. a network of hormone production that work together to create life.
8. a system that removes excess and waste products from the body to maintain homeostasis.
9. One of a pair of bones at the base of the front of the neck.
10. made of connective tissue reinforced with calcium.
13. your body's outer layer.
15. includes the brain, spinal cord, and a complex network of nerves.
20. type of cell division during which a single cell divides twice and produces four daughter cells.