The Circulatory System

Essay specific features

 

Issue:

Science

 

Written by:

Ronald D

 

Date added:

August 3, 2013

 

Level:

University

 

Grade:

A

 

No of pages / words:

5 / 1399

 

Was viewed:

9468 times

 

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Essay content:

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. Circulation begins early in fetal life. It is estimated that a given portion of the blood completes its course of circulation in approximately 30 seconds...
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The superior vena cava and the inferior vena cava. When the right auricle contracts, it forces the blood through an opening into the right ventricle. Contraction of this ventricle drives the blood to the lungs. Blood is prevented from returning into the auricle by the tricuspid valve, which completely closes during contraction of the ventricle...
displayed 300 characters

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