By Susan Whittemore
ISBN-10: 0791076261
ISBN-13: 9780791076262
The Circulatory process describes the anatomical layout good points of the human circulatory approach, the center blood vessels, and the blood, as well as the capabilities they serve. solutions to such simple questions as "How does the center work?" and "What is blood strain and why is it so important?" are addressed. The ebook strives to advertise a uncomplicated figuring out of the elemental actual and organic rules underlying circulatory functionality. exam of the way the human circulatory procedure responds to such demanding situations as elevated job, the microgravity of house, and hemorrhage toughen readers' realizing of circulatory functionality and its homeostatic legislation.
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Additional resources for The Circulatory System (Your Body: How It Works)
Example text
A quadruple bypass surgery means that four separate coronary arteries are bypassed using this technique during one operation. Bypass surgery has become safer and fairly routine and is successful at improving heart function and reducing angina in most individuals with coronary-artery disease. q 58 12/20/06 3:19 PM Page 58 THE CIRCULATORY SYSTEM their respective sides of the heart. Blood flow through these arteries can increase up to nine times the resting rate during intensive exercise, when the heart is pumping maximally.
Many bloodborne diseases, such as HIV and hepatitis C, have been transmitted through blood transfusions. Donated blood must be carefully screened for such diseases before it can be used. Donated blood must also be typed to prevent life-threatening reactions caused by a patient receiving an incompatible blood type. 6% of the population possesses this blood type. Storing blood can be a problem as well, particularly under military and other field conditions. Donated blood has a limited shelf life and must be discarded after six weeks.
Unprotected hemoglobin is rapidly destroyed, and transfusions of hemoglobin would need to be given repeatedly. In addition, cell-free hemoglobin solutions appear to trigger high blood pressure in some patients by stimulating constriction of the blood vessels. Other groups of scientists are attempting to develop an artificial red blood cell using pig blood. This option has some advantages over the cell-free system in that the hemoglobin is protected within a cell and does not degrade as quickly or increase blood pressure.
The Circulatory System (Your Body: How It Works) by Susan Whittemore
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