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The circulatory system consists of the cardiovascular and the Lymphatic system. Cardiovascular refers to the heart and blood vessels and the lymphatic system includes structures involved in the conveyance of the fluid lymph.

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This system provides the body cells with needed substances, transports waste products for disposal, maintains the acid balance of the body , prevents hemorrhage through blood clotting, protects against disease , and helps to regulate body temperature. There are five anatomic types of blood vessels that the circulatory system uses. Blood leaves the heart through arteries which branch to become arterioles. These branch even more to become one cell thick capillaries. This is where oxygen and and waste carbon dioxide are exchanged. The blood then returns to the heart through venules, which flow into veins. The heart is much like the engine of our body. It has four chambers. The right atrium and ventricle, which only has deoxygenated blood. The blood comes in through the inferior and superior vena cava, is forced from the right atrium into the right ventricle which pumps the blood to the lungs. The left atrium and ventricle only deals with oxygenated blood.  The blood comes into the  left atrium which is forced to the left ventricle and then pumped to the rest of the body. Blood pressure is the pressure exerted by blood on the wall of an arterty. Blood pressure readings consists of two numbers as a fraction. The top number is the systolic pressure, or maximum pressure . The bottom number is the diastolic pressure, or pressure while the heart is relaxed. The lymphatic systems primary function is to collect fluid that escapes from the blood capillaries and return it to circulation. This escaped fluid is called lymph.

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Myocardial ischemia is the deficiency of blood supply to the myocardium.
A septal defect is a defect in the wall separating the left and right side of the heart. The defect is usually congenital and is either an atrial septal defect or a ventricular septal defect.
Coronary heart disease is heart damage that results from insufficient oxygen caused by pathologic changes in the coronary arteries.

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Cardiopulmonary bypass is a method used to divert blood away from the heart and lungs temporarily when surgery is performed. A heart-lung machine collects the blood , replenishes it with oxygen, and returns it to the body.

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Echocardiography is the term generally associated with the use of ultrasonography in diagnosing heart disease. An echocardiogram is record of the heart obtained by directing ultrasonic waves through the chest wall.

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1. Which side of the heart deals with oxygenated blood.
2. Which is the smallest blood vessels.
3.What is the fluid that escapes from blood capillaries