The Heart, It's Diseases, and Functions

Essay by Anonymous UserJunior High, 8th gradeA+, February 1997

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You need your heart for all your body needs. It pumps about 2000

gallons of blood a day. It takes about 20 seconds for blood to reach

every cell in the body. An artery carries blood out from the heart. A

vein carries blood back to the heart. An average adult heart weighs about

10-13 ounces (300 to 350 grams). The rate which the heart pumps varies

depending on what your doing. When at rest the heart pumps more slowly.

When you run the heart rate increases to provide muscles and other tissues

with additional oxygen they need. The typical heart rate is 72 beats per

minute. Each beat gives out 2-3 ounces of blood pumped into the arterial

system. At this heart rate it beats about 104,000 times a day. The

Superior and Inferior are the biggest veins in the body.

The Superior is really the biggest. These veins have a lot of

carbon dioxide and have oxygen-poor blood.

The aorta is the biggest

artery in the whole body. Which will be covered in the report. The

pulmonary vein takes the blood out of the heart and takes it to the


Today we will talk about many different parts of the heart:

The Three Layers of Muscle, Atriums, Ventricles, Systole and Diastole,

Treatments for the Heart, Valves, and many Diseases.

The Three Layers of Muscle

The heart has three layers of a muscular wall. A thin

layer of tissue, the pericardium covers the outside, and another layer,

the endocardium, lines the inside. The myocardium is the middle layer and

is the biggest of all. Myocardial Infarction is a disease later read

about in this report. The pericardium is a fibrous sac which is very

smooth lining. In the space space between the pericardium and epicardium

is a...