BIOL 1344 Lecture Notes - Lecture 8: Pulmonary Artery, Vasoconstriction, Arteriole
14 Sep 2016
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Flow is related to change in pressure/resistance. Cross sectional area is reciprocal to flow/velocity. All capillaries combined= 4500 cm^2 [more flow, low velocity] Aorta= 4. 5 cm^2 [less flow, high velocity] Sv: volume of blood leaving each side of the heart. Edv-esv [135-65=70ml leaves both rt. ventricle & lt. ventricle. Left side of heart fails > pulmonary hypertension > pulmonary edema. Blocking vein will not stop blood flow. (16-21)= -5mmhg > draws fluids back and fluid is reabsorbed. 90% is reabsorbed, 10% taken away by lymphatics. Blood pressure: korotkoff sounds due to blood flow. Mean arterial pressure= diastolic pressure +1/3 pulse pressure. Vasodilation- bp falls[ >sympathetic input > epinephrine > b2 receptors. Vasoconstriction- bp rise [ > sympathetic input > epinephrine > alpha1 receptors > vasoconstriction] Aldosterone- sodium retention- water retention- bp rises. Atrial natriuretic petitide [heart]- vasodilation > decreases bp.
