PSIO 202, Lecture 11

PSIO 202, Lecture 11 - PSIO 202 Human Anatomy and...

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PSIO 202 Human Anatomy and Physiology Lecture 11. Control of Blood Pressure and Flow
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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
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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 )
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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 vasoconstriction.
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CV “Reflexes” ±
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