MA+Cardio+System

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? Arteries, capillaries, and veins. (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?
 * Blood
 * Blood vessels and the heart
 * 1) The heart pumps blood all through the body.
 * 2) The blood helps fight infections, regulates temperature, and regulated ph levels.
 * Arteries: Consists of three levels. 1) Endothelium: thin cells that make up the inner level 2) Middle layer is smooth muscle 3) The outer layer is connective tissue. These walls allow the artery to be protect under pressure and allows them to expand. Arteries carry blood from the heart.
 * Capillaries: Arterioles branch out and become capillaries. Capillaries are made of endothelium.
 * Veins: Veins have the same layers as arteries but has less of the middle layer. Veins are thinner than arteries, because of this they can expand further. Veins carry blood to the heart.
 * The heart is a double pump because it is pumping blood to the lungs and blood to the body at the same time but they never intersect.
 * Lub: "Cusps of Av valve" slam shut due to pressure
 * Dup: When the ventricles relax and the blood begins to glow again.
 * The SA node sends a signal ever .85 seconds which causes the atria to contract. The signal is then sent to the AV.
 * The pulse rate tells how many beats the heart has beat in a minute.
 * The blood flow in the arteries is called blood pressure.
 * Skeletal pump: caused by skeletal muscle contraction
 * Respiratory Pump: caused by breathing
 * valves in the veins