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The Human Heart - Online Term Paper

The Human Heart

is a specialized, four chambered muscle that
maintains blood flow in the circulatory system. The heart is located in the
thorax, it lies left of the body's midline, above and in contact with the
diaphragm. It is behind the breastbone, or sternum, and between the lungs,
with its apex tilted to the body's cavity left side. In most people the
apex can be felt during each heart contraction. When the heart is at rest,
the heart pumps about 59cc (2 oz) of blood per heart beat and 5 l (5qt) per
minute, compared to 120-220cc (4-7.3oz) per beat and 20-30 l (21-23 qt) per
minute during exercise. The adult human heart is about the size of a fist
and weighs about 250-350 gm (9oz).

Blood supplies ...

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Muscle tissue, or myocardium, is
the middle layer. The inner layer, or endocardium, that lines the inside of
the heart muscle consists of a thin layer of endothelial tissue overlying a
thin layer of vascularized connective tissue. The outside of the heart, the
epicardium, is in intimate contact with the pericardium; this serous
membrane is a closed sac covering the heart muscles outside wall. Within
the sac, a small amount of fluid reduces the friction between the two
layers of tissue. In addition to, muscular and connective tissue, the heart
muscle contains varying amounts of fatty tissue, especially on the outside.
Both anatomically and functionally, the heart is divided in to a left and a
right half by the cardiac septum. Each half contains two separate spaces:
the atrium, or auricle, and the ventricle. The upper reservoirs, or
collecting chambers, are the thin-walled atria, and the lower pumping
chambers are the thick-walled ventricles. The total thickness of the
ventricular ...

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The Human Heart. (2004, March 26). Retrieved December 23, 2024, from http://www.essayworld.com/essays/The-Human-Heart/5199

"The Human Heart." Essayworld.com. Essayworld.com, 26 Mar. 2004. Web. 23 Dec. 2024. <http://www.essayworld.com/essays/The-Human-Heart/5199>

"The Human Heart." Essayworld.com. March 26, 2004. Accessed December 23, 2024. http://www.essayworld.com/essays/The-Human-Heart/5199.

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PAPER DETAILS

Added: 3/26/2004 09:15:03 AM
Category: Health & Medicine
Type: Premium Paper
Words: 526
Pages: 2

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