The Heart

3. An indication of cardiovascular health because ______ blood pressure when resting is an indication for clogged arteries.
4. This has a thicker layer of muscle compared to a vein.
6. Small veins that receive blood from the capillaries.
7. This node sends signals down the a ________ bundle and it passes into large fibers.
9. These fibers signal the ventricles to contract.
10. These cells are smaller than the other type of cell in your body.
12. What node initiates the heart beat? This node also sends out a stimulus that causes the atria to contract.
13. Veins carry blood __________ the heart.
15. Blood that carries blood against gravity have _______ to keep blood flowing toward the heart.
16. How many sounds are there for a heart beat?
18. exchange at the _________ beds is primarily a result of osmotic and blood pressure.
19. These are microscopic vessels between arterioles and venules.
20. Osmotic pressure is higher than blood pressure in this end.
21. A cone-shaped, muscular organ located between the lungs, directly behind the sternum
22. This side of the heart collects the blood flowing around the body and then pumps it through the lungs to pick up oxygen.
23. The first sounds of a heart beat, typically low and dull and lasts longer than the second sound.

1. When a chamber contracts.
2. This cell has a nucleus, fights infections and translucent if not stained.
4. ___________end blood pressure is higher than osmotic pressure.
5. Each heartbeat.
8. Arrangements of protein fibers that prevent over stretching of adjacent cells.
11. When a chamber relaxes.
14. The second sound that follows the first sound after a brief pause.
17. This tissue makes up the layer that makes up the capillaries.