Blood Flow and Gas Transport

Blood Flow and Gas Transport - 1 BLOOD FLOW AND GAS...

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1 BLOOD FLOW AND GAS TRANSPORT I. CARDIAC OUTPUT DURING EXERCISE A. Cardiac Output and Oxygen Transport Cardiac output ("Q") - the amount of blood pumped by either the left or right ventricle of the heart per minute. Both the left and right ventricles must have the same cardiac output so that blood flow through the pulmonary and systemic circuits is maintained equally. Stroke volume - the amount of blood pumped by either the left or right ventricle per beat. Cardiac output = heart rate X stroke volume Since the blood transports oxygen, when cardiac output increases in exercise more oxygen will be transported to the working muscles. This relationship can be expressed by the Fick equation: VO 2 = HR X SV X (a-vO 2 ) diff where: VO 2 = oxygen uptake or utilization by the tissues in the body (a-vO 2) diff = arterial-mixed venous oxygen difference Therefore, in order to increase oxygen uptake, you must increase cardiac output and/or extract more oxygen from the arterial blood. In general, the higher the maximal stroke volume --> higher maximal
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This note was uploaded on 02/01/2010 for the course KIN 142 taught by Professor Asmundson during the Spring '09 term at Simon Fraser.

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Blood Flow and Gas Transport - 1 BLOOD FLOW AND GAS...

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