Cardiovascular+System+CC

Cardiovascular System

(1) What are the two parts of the cardiovascular system? a) the heart- pumps blood b) blood vessels- carries blood

(2) What are the functions of the cardiovascular system? a) blood pressure moves blood through the body by contractions of the heart b) blood vessels transport blood from the heart into arteries, capillaries and veins and finally back to the heart. c) gas exchange at the capillaries refreshes the blood with oxygen d) the heart regulates blood flow due to the needs of the body

(3) What are the types of blood vessels? -arteries, capillaries, and veins

(4) What is the structure and function of these vessels? -Arteries carry the blood from the heart, Capillaries allow the gas exchange of oxygen and carbon dioxide between the alveoli and the blood stream, and finally the blood is carried back to the heart by veins.

(5) Why is the heart a double pump? -Because it is getting blood pumped in, and it then pumps blood out as well. The two sides of the heart do different things, one taking blood to the lungs to get oxygen, and one pumping blood out in to the body.

(6) What causes the "lub" and the "dup" of the heart sounds? -The lub DUB is caused by a valve between the atrium and the ventricle opening and closing and there is a valve between the ventricle and the artery (aorta) closing and opening.

(7) What keeps the heart beat regular? -The heart receives and electric pulse from the brain which keeps the heart beating at a regular pace.

(8) What does the pulse rate of a person indicate? -A pulse is when the heart contracts, pushing blood out into the body through the arteries. So every time you feel your pulse, that is an artery pushing blood.

(9) What accounts for blood flow in the arteries? -Blood flows through arteries when the heart contracts in the left ventricle, causing the blood to be pushed out into the body from the heart, and flow through the body.

(10) What accounts for blood flow in the veins? -when the blood has run through the body, it then returns to the heart with out oxygen through veins. It returns to the right side of the heart, through veins, where it is then taken back to the lungs to get oxygen, and is then taken back to the heart where it then flows back through the arteries throughout the body. The cycle continues on and on.