homeostasis

2. gland is a small organ in the front of the neck that wraps around the windpipe.
3. the red liquid that circulates in the arteries and veins of humans and other vertebrate animals, carrying oxygen to and carbon dioxide from the tissues of the body.
6. is One of a pair of organs in the chest that supplies the body with oxygen, and removes carbon dioxide from the body.
7. are a pair of spongy, air-filled organs located on either side of the chest
8. any of the tubular structures in the vascular system of a plant, serving to conduct water and mineral nutrients from the root.
10. system is a biological system in animals and plants that consists of specific organs and structures used for gas exchange.
12. is a group of cells that have similar structure and that function together as a unit.

1. is any self-regulating process by which an organism tends to maintain stability while adjusting to conditions that are best for its survival.
4. the smallest structural and functional unit of an organism, which is typically microscopic and consists of cytoplasm and a nucleus enclosed in a membrane.
5. system is an organ system consisting of skeletal, smooth and cardiac muscles.
9. pumping blood through the blood vessels by repeated, rhythmic contractions.
11. are a self-contained part of an organism that performs a specific vital function, such as the heart or liver in humans.