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The Circulatory System - Online Term Paper

The Circulatory System

Circulatory System in anatomy and physiology. The course taken by the blood through the arteries, capillaries, and veins back to the heart. In humans and the higher vertebrates, the heart is made up of four chambers. The right and left auricles, or atria, and the right and left ventricles. The right side of the heart pumps oxygen poor blood from the cells of the body back to the lungs for new oxygen. The left side of the heart receives blood rich in oxygen from the lungs and pumps it through the arteries to the various parts of the body.
Pulmonary circulation, blood from the entire body is transported to the right atrium through two large veins. The superior vena cava and the ...

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is collected into the portal vein and carried to the liver.
Coronary circulation is the means by which the heart tissues themselves are supplied with nutrients and oxygen and are freed of wastes. Just beyond the semiluna valves, two coronary arteries branch from the aorta.
Heart action consists of systole and relaxation of the muscular walls of the atria and ventricles. During the period of relaxation, the blood flows from the veins into the two atria. This action is sudden and occurs almost simultaneously in both atria. The mass of blood in the veins makes it impossible for any blood to flow backward. The ventricular systole immediately follows the atrial systole. The heart is entirely at rest for a short time after the ventricular systole occurs with every beat. The heart emits two sounds, which are followed by a short pains, the first sound, concidering with the ventricular systole, is dull and protracted the second sound. Made by the sudden closure of the ...

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The Circulatory System. (2007, March 10). Retrieved December 23, 2024, from http://www.essayworld.com/essays/The-Circulatory-System/61539

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PAPER DETAILS

Added: 3/10/2007 10:29:49 AM
Category: Health & Medicine
Type: Premium Paper
Words: 521
Pages: 2

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