Cardiovascular+System+CH

Cardiovascular System
(1) What are the two parts of the cardiovascular system? Heart and blood vessels.

(2) What are the functions of the cardiovascular system? 1.Generates blood pressure to move blood through the blood vessels. 2. Transports blood 3. Refreshes blood and tissue fluid 4. Regulates blood flow

(3) What are the types of blood vessels? Arteries, capillaries, and veins.

(4) What is the structure and function of these vessels? The arteries have three layers and move blood away from the heart. The capillaries are extremely narrow tubes that diffuse oxygen and carbon dioxide. The veins have three thin layers and take blood to the heart.

(5) Why is the heart a double pump? Both the left and right ventricles have different functions of pumping. The left sends blood throughout the body, while the right sends out blood for the lungs.

(6) What causes the "lub" and the "dup" of the heart sounds? The "lub" is when increasing pressure of blood inside a ventricle forces the cusps of the AV valve to slam shut. The "dup" is when the ventricles relax, and blood in the arteries pushes back, causing the semilunar valves to close.

(7) What keeps the heart beat regular? Your heartbeat is kept regular by the SA node which uses electircal signals to tell the heart when to beat. Externally the body may cause the heart to beat faster in times where hormones are released or physical activity is increased.

(8) What does the pulse rate of a person indicate? It shows how fast their heart is beating.

(9) What accounts for blood flow in the arteries? Simply, blood pressure.

(10) What accounts for blood flow in the veins? The skeletal muscle pump, respiratory pump, and valves.