Cardiovascular+System-Faith

Click on this == =__**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 "dup" 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?
 * the heart (pumps the blood)
 * blood vessels (way in which the blood flows)
 * contractions of the heart generate the blood pressure and blood pressure moves blood through the two circuits
 * the heart and the blood vessels keep O2 rich blood separated from O2- poor blood
 * Valves in the heart and veins keep the blood flowing in one direction
 * the heart and blood vessels regulate blood flow according to the needs of the body
 * exchange across capillary walls refreshes blood and tissue fluid
 * arteries
 * capillaries
 * veins
 * Arteries
 * has three layers (endothelium,thick layer of smooth muscle and elastic tissue, and connective tissue)
 * the walls gives the artery support when blood enters under pressure the elastic tissue expands and absorbs the pressure
 * Capillaries
 * composed of endothelium with a basement membrane
 * open at a given time and when it is open the blood flows through and goes to a venule.
 * when it passes through it gives up oxygen and the blood goes from being red to blue
 * Veins
 * have the same three layers as arteries but is less smooth muscle and less connective tissue
 * they carry blood against gravity and prevent the backward flow of blood when they are closed (also have valves)
 * at any one time about 70% of the blood is in the vein and act as blood reservoirs
 * because the right ventricle of the heart sends blood through the lungs and the left ventricle sends blood throughout the body
 * the lub is caused by vibrations occurring when the atrioventricular valves close due to ventricular contraction
 * the dup is caused when the semilunar valves close due to back pressure of blood in the arteries
 * intrinsic conduction system of the heart
 * the rate of the heartbeat because the arterial walls pulse whenever the left ventricle contracts
 * blood pressure
 * skeletal muscle contraction
 * presence of valves in the veins
 * respiratory movement



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