KINE 1P90 Lecture Notes - Lecture 10: Blood Vessel, Cardiac Output, Skeletal Muscle
4 Nov 2016
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Document Summary
Arteries, arterioles and capillaries transport blood from the heart to the tissues. Capillaries venules and veins transport blood back to the heart. Blood is constantly reconditioned so composition remains relatively constant. Reconditioning organs receive more blood than needed for metabolic needs. Blood flow to other organs (skeletal muscle) serves only to meet their metabolic needs, and thus is adjusted to meet these metabolic needs at any given time. For example, the requirements of the muscle tissue during exercise can increase 15 to 25 times compared to resting levels. Only the absolute blood flow to the brain is kept constant. The volume of flow through a vessel is directly proportional to the pressure gradient between the two ends of the vessels, and inversely related to the resistance encountered. The pressure gradient is the difference in pressure between the beginning is caused and the end of the vessel. Resistance is caused by the friction between the following blood and the vessel walls.
