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Block C - Cardiovascular Physiology Introduction.docx

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Physiology
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PHYL 1010Y
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CARDIOV ASCULAR PHYSIOLOGY MODULE IX BLOCK C CARDIOVASCULAR PHYSIOLOGY Module IX In this module, you will learn about the blood and the cardiovascular system. The blood functions as a  "carrier" for the transport of substances to and from the body's tissues, the blood vessels are the conduits that  enable the blood to reach the tissues, and the heart is the pump that propels the blood through the vessels. A  general scheme showing how blood flow is distributed to the organs is as follows: Figure M9­1. Blood Flow to the Organs. The heart is a single physical entity. However, as you will learn in Unit 1, and as visualized in Figure  M9­1 above, the heart functions as two separate pumps. The left ventricle (top right of figure) pumps oxygenated  blood into the arteries of the systemic (larger) circulation; the pressure this pump imparts to the blood is  sufficient to push it through the vessel system all the way back to the right ventricle (top left). Blood entering the  right ventricle has given up oxygen to the tissues, and part of it has been "cleaned" by passing through the  kidneys. The right ventricle's job is to pump it through the lungs (where it can release carbon dioxide and be re­ oxygenated), and on to the left ventricle. In Unit 2, you will explore how the 
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