PSIO 202, Lecture 11

Psio 202 lecture 11

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Unformatted text preview: PSIO 202 Human Anatomy and Physiology Lecture 11. Control of Blood Pressure and Flow Objectives and Reading Assignment Reading: Tortora, pages 775-781 Objectives Describe and diagram the baroreceptor and chemoreceptor reflex pathways, starting with the stimulus and ending with the physiological result Describe how hormones can either decrease or increase blood pressure Compare and contrast neural, humoral and local regulation of blood vessel diameter and blood flow The Cardiovascular “center” The CV center is located in the medulla oblongata It consists of a collection of functionally similar neurons that help to regulate HR, SV, and blood vessel diameter The CV neurons receive input from higher brain centers (cortex, limbic system, hypothalamus) and from peripheral afferent nerve fibers (baroreceptors, chemoreceptors and proprioceptors) Neurons of the “Cardiovascular Center” The CV center is composed of three major functional regions: a collection of sympathetic neurons that increase HR and contractility a collection of parasympathetic neurons that decrease heart rate “Vasomotor” neurons that regulate blood vessel diameter via sympathetic nerves that synapse on arteriolar smooth muscle and cause vaso...
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