Circulatory System

1. Node Located in the right atrium. Sends signals that tell the heart when to beat.
6. Returns the blood to the heart.
8. Special class of white blood cells that produce antibodies that are proteins that help destroy pathogens
10. Thick layer of muscle in the walls of the heart.
11. The fluid that leaks from the blood into the surrounding tissues.
12. Air moves from the pharynx to the trachea, a flap of tissue called the epiglottis covers the entrance to the trachea when you swallow (windpipe).
14. Stop blood from entering a chamber.
17. Smallest of the blood vessels. Walls are only one cell thick. They bring nutrients and oxygen to the tissues and absorbing carbon dioxide and other waste products from them.
20. The iron-containing protein that binds to oxygen in the lungs and transports it to tissues. Gives the red blood cells their color.
21. The tube at the back of the mouth (throat). Serves as a passage way for both air and food.
23. Large vessels that carry blood from the heart to the tissues of the body. All arteries except for the pulmonary arteries carry oxygen-rich blood.

2. The upper chamber of the heart which receives the blood.
3. 2 large passageways in the chest cavity that air passes through from the larynx to the trachea. Each bronchus leads into one of the lungs. Within each lung, the large bronchus subdivides into smaller bronchi, which lead to even smaller passageways called bronchioles.
4. Circulation Circulation that pumps the blood to the rest of the body.
5. A condition in which fatty deposits called plaque build up on the inner walls of the arteries.
7. The loss of elasticity in the tissues of the lungs. This condition makes breathing very difficult.
9. Millions of tiny air sacs used for gas exchange.
13. Top of the trachea, contains 2 highly elastic folds of tissue know as the vocal cords.
15. Circulation The pathway that pumps the blood from the heart to the lungs.
16. The large, flat muscle at the bottom of the chest cavity (the breathing muscle).
18. The lower chamber of the heart which pumps blood.
19. Plasma is about 90% water, and 10% dissolved gases, salts, nutrients, enzymes, hormones, waster products, and proteins call plasma proteins.
21. Forms clots to help stop bleeding from damages blood vessels. Smallest cell in the body
22. Giant artery that sends blood from heart to the body