Animal Structures

4. The process by which organisms maintain a stable internal environment.
6. An animal that feeds on dead organisms.
10. A tube that carries blood through the body.
12. System The system that transports nutrients, gases, and wastes throughout the body.
13. Feeder An organism that strains small organisms or particles from water.
17. Digestion The chemical breakdown of food using enzymes and acids.
18. A respiratory organ that extracts oxygen from water.
20. An animal that eats only plants.
21. System The system responsible for removing wastes from the body.
23. A specialized cell that transmits nerve impulses.

1. System The body system that controls and coordinates body activities.
2. System The system responsible for breaking down food and absorbing nutrients.
3. An animal that eats both plants and animals.
5. Digestion The physical breakdown of food into smaller pieces.
7. A bundle of fibers that transmits signals in the body.
8. System The body system that enables movement.
9. A muscular organ that pumps blood through the body.
11. A small external opening used for breathing in some invertebrates.
12. An animal that eats other animals.
14. A respiratory organ that allows animals to breathe air.
15. An organ that filters waste from the blood.
16. A rigid or flexible framework that supports the body.
19. An animal that is hunted and eaten by another animal.
22. System The system responsible for exchanging oxygen and carbon dioxide.