Warning: Use of undefined constant referer - assumed 'referer' (this will throw an Error in a future version of PHP) in /usr/home/essaywo/public_html/essays on line 102

Warning: Use of undefined constant host - assumed 'host' (this will throw an Error in a future version of PHP) in /usr/home/essaywo/public_html/essays on line 105

Warning: Cannot modify header information - headers already sent by (output started at /usr/home/essaywo/public_html/essays:102) in /usr/home/essaywo/public_html/essays on line 106

Warning: Cannot modify header information - headers already sent by (output started at /usr/home/essaywo/public_html/essays:102) in /usr/home/essaywo/public_html/essays on line 109
The Circulatory System - Online Term Paper

The Circulatory System


in anatomy and physiology is the course taken by
the blood through the arteries, capillaries, and veins and 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. 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.

Pulmonary ...

Want to read the rest of this paper?
Join Essayworld today to view this entire essay
and over 50,000 other term papers

is oxygenated, that
is, then it is brought back to the heart by the four pulmonary veins, which
enter the left auricle. When this chamber contracts, blood is forced into the
left ventricle and then by ventricular contraction into the aorta. The bicuspid,
or mitral, valve prevents the blood from flowing back into the auricle, and the
semilunar valves at the beginning of the aorta stop it from flowing back into
the ventricle. Similar valves are present in the pulmonary artery.

The aorta divides into a number of main branches, which in turn divide
into smaller ones until the entire body is supplied by an elaborately branching
series of blood vessels. The smallest arteries divide into a fine network of
still more minute vessels, the capillaries, which have extremely thin walls;
thus, the blood is enabled to come into close relation with the fluids and
tissues of the body. In the capillaries, the blood performs three functions then
it releases its oxygen to the tissues, it furnishes ...

Get instant access to over 50,000 essays.
Write better papers. Get better grades.


Already a member? Login

These then break
up into an elaborate capillary network in the heart muscle and valve tissue.
Blood from the coronary capillary circulation enters several small veins, which
then enter directly into the right auricle without first passing into the vena
cava.

The action of the heart consists of successive alternate contraction
and relaxation of the muscular walls of the auricles and ventricles. During the
period of relaxation, the blood flows from the veins into the two auricles,
gradually distending them. At the end of this period, the auricles are
completely dilated then their muscular walls contract, forcing almost the entire
contents through the auriculoventricular openings into ...

Succeed in your coursework without stepping into a library.
Get access to a growing library of notes, book reports,
and research papers in 2 minutes or less.


CITE THIS PAGE:

The Circulatory System. (2005, April 23). Retrieved March 29, 2024, from http://www.essayworld.com/essays/The-Circulatory-System/25812
"The Circulatory System." Essayworld.com. Essayworld.com, 23 Apr. 2005. Web. 29 Mar. 2024. <http://www.essayworld.com/essays/The-Circulatory-System/25812>
"The Circulatory System." Essayworld.com. April 23, 2005. Accessed March 29, 2024. http://www.essayworld.com/essays/The-Circulatory-System/25812.
"The Circulatory System." Essayworld.com. April 23, 2005. Accessed March 29, 2024. http://www.essayworld.com/essays/The-Circulatory-System/25812.
JOIN NOW
Join today and get instant access to this and 50,000+ other essays


PAPER DETAILS
Added: 4/23/2005 09:56:13 PM
Category: Health & Medicine
Type: Premium Paper
Words: 1389
Pages: 6

Save | Report

SHARE THIS PAPER

SAVED ESSAYS
Save and find your favorite essays easier

SIMILAR ESSAYS
» The Circulatory System
» The Circulatory System
» The Effects Of Altitude On Huma...
» The Heart And Its Functions
» Endocrine System: Addison's Dis...
» The Heart
» The Human Heart
» Magnificent Minds Of The Renai
» Classifying Organisms
» How Nutrients Get In, And Waste...
Copyright | Cancel | Contact Us

Copyright © 2024 Essayworld. All rights reserved