Section Handout #6

Section Handout #6 - hannashim@gmail.com OH: Tuesdays @ 4PM...

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hannashim@gmail.com OH: Tuesdays @ 4PM @ Café Roma BIPN 100 Hand-Out #6 2 MAJOR CONTROLLED VARIABLES REGULATING THE CARDIOVASCULAR SYSTEM 1. Cardiac Output (= Stroke Volume x Heart Rate) 2. Blood Pressure MAJOR SENSERS OF BLOOD PRESSURE 1. Stretch Receptors (Baroreceptors) in the Aortic Arch 2. Stretch Receptors in the Carotid Sinuses REGULATION OF THE CARDIOVASCULAR SYSTEM Increase in pressure detected by baroreceptors in the aortic arch and carotid sinuses cardiac control center parasympathetic neurons (with axons in the VAGUS NERVE) become active [sympathetic activity may also decrease] decreased heart rate (affected by both parasympathetic and sympathetic) AND decreased heart contractility (only if sympathetic activity decreases) ALSO: Increase in pressure increased baroreceptor activity vasomotor center decreased sympathetic neuronal activity (also decreased secretion of epinephrine and norepinephrine from adrenal medulla) vasodilation decrease in blood
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