Ch. 4 Vocab

4. / A push or pull.
6. / A group of cells located in the right atrium that sens out signals that make the heart muscle contract and that regulates heartbeat rate.
8. / An instrument that measures blood pressure.
10. / A blood vessel that carries blood away from the heart.
12. / A blood vessel that carries blood back to the heart.
13. / Each of the two lower chambers of the heart that pumps blood out of the heart.
14. / The process by which molecules move from an area in which they are highly concentrated to an area in which they are less concentrated.

1. / The largest artery in the body.
2. / A disorder in which a person's blood pressure is consistently higher than normal.
3. / The force that something exerts over a given area.
5. / A tiny blood vessel where substances are exchanged between the blood and the body cells.
7. / Each of the two upper chambers of the heart that receives blood that comes into the heart.
9. / A condition in which an artery wall thickens as a result of fatty materials.
11. / A hollow, muscular organ that pumps blood throughout the body.
12. / A flap of tissue in the heart or a vein that prevents blood from flowing backwards.