Kinesiology 2230A/B Lecture Notes - Lecture 3: Valsalva Maneuver, Atrioventricular Node, Mean Arterial Pressure
27 Sep 2018
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Vo2 of the brain can double during cerebral activity. When talk about arterial system, call them resistance vessels: they can change diameter quickly with smooth muscle surrounding arteries, as diameter changes, resistance changes. When talk about the venous circulation, call them capacitance vessels: side where most blood is stored/pooled at rest (about 64%) Vo2 = hr x sv x (a-vo2diff: heart: hr x sv, tissue: (a-vo2diff) Take a-vo2 difference and how much o2 is being delivered in cardiac output determines o2 consumption. If a-vo2 difference is greater, o2 consumption will increase. Venous circulation: blood returns to heart via ivc & svc r atrium r ventricle r &l pulmonary arteries aorta systemic circulation. Left side pumps to rest of body. Arteries carry blood away from the heart doesn"t necessarily mean that they are oxygenated. Heart is a muscle and requires oxygen aerobic muscle.
