Kinesiology 2230A/B Lecture Notes - Lecture 21: Circulatory System, Myofibril, Necrosis
19 Oct 2018
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Anything downstream to blockage in artery will have reduced blood flow which is problematic. If an area become hypoxic, can lead to areas of hypoxia (reduction of o2) When an area of heart or tissue becomes hypoxic, especially for long period of time. Can experience a heart attack for several hours. Necrosis or necrotic tissue occurs which is scar tissue. That particular area doesn"t contract or relax any longer. Integrity of contractile proteins (actin and myosin) is lost. That area of the heart won"t contribute to increase in pressure that leads to ejection of blood into systemic circulation. Going from supine to standing position, will have to work against effects of gravity on blood in the vascular system. When you stand, have to pump blood from feet to your heart. Hr lower in swimming or rowing because sitting/pronated. Esv doesn"t change much as intensity increases. Only at peak exercise, esv decreases a little meaning sv will increase.
