Cardiovascular+System

(1) What are the two parts of the cardiovascular system? (2) What are the functions of the cardiovascular system? (3) What are the types of blood vessels? (4) What is the structure and function of these vessels? (5) Why is the heart a double pump? (6) What causes the "lub" and the "dub" of the heart sounds? (7) What keeps the heart beat regular? (8) What does the pulse rate of a person indicate? (9) What accounts for blood flow in the arteries? (10) What accounts for blood flow in the veins?

1. The two main parts of the cardiovascular system are the blood vessels and the heart.

2. The function of the cardiovascular system is to pressurize blood to send to the rest of the body, and move blood vessels and blood.

3. The various kinds of blood vessels are veins, capillaries, and arteries.

4. The structure of these blood vessels has an inside layer of cells called the endothelium. The middle of the blood vessels is made of strong muscle. The outside is made of tissue.

5. The heart is known as a double pump, because the left ventricle sends blood all throughout the body. The right ventricle sends blood directly to the lungs.

6. The "lub dub" sound is a distinct sound that the heart makes. The "lub" sound comes from the Aortic valve closing. The "dub" sound comes from the semilunar valves closing.

7. The heartbeat is kep normal and in tune by the sinoatrial node.

8. The pulse rate of the heart reflects the heart rate of the person.

9. Blood flow comes from skeletal muscle. Blood pressure affects blood flow and volume.