Across
- 4. tiny air sacs in the lungs that are the site of gas exchange between the lungs and blood; singular: alveolus.
- 6. the system that transports blood and other fluids throughout the body.
- 7. organs of the respiratory system that bring oxygen-rich air into the body and send oxygen-poor air out of the body.
- 9. a chamber in an animal's heart that pumps blood out to the body.
Down
- 1. the body system that delivers blood to different parts of a body; consists of the heart, blood, and blood vessels.
- 2. a small blood vessel that transports nutrients and gasses between the blood and tissues in an animal.
- 3. the muscular organ of an animal that pumps blood throughout the body.
- 5. a blood vessel that carries blood away from the heart.
- 8. blood vessels that carry blood toward the heart.