BIOL 031 Lecture Notes - Lecture 17: Heart Rate, Sympathetic Nervous System, Edma
18 Aug 2020
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Document Summary
Vessels involved in returning excess filtrate to circulation: filtrated in the lymph nodes, no pump that moves it. Vessels form open system starting at capillaries. Cardiovascular physiology blood vessels, blood flow, blood pressure. Mean arterial pressure (map) the pressure in the aorta occurring during a cardiac cycle; pressure needed to drive the blood through the system. Therefore: map = (hr x sv) x tpr. In the aortic arch and carotid sinuses (blood flow to brain) Respond to stretching due to pressure changes in arteries. Integration center = cardiovascular centers in the brainstem neurons. Medulla oblongata relays signals from sympathetic and parasympathetic. Receives input from baroreceptors regarding pressure changes. Decrease in mean arterial pressure causes baroreceptor action potentials to fire less: activation of sympathetic, reduction of parasympathetic system. Example: hemorrhage: results in a decrease in blood volume, blood volume decrease decrease in mean arterial pressure, triggers the baroreceptive reflex. Cold = induces vasoconstriction to reduce swelling and edma after an injury.
