Concept explainers
To discuss:
The role of the vasomotor center of the medulla oblongata in controlling blood flow; baroreflexes, chemoreflexes, and medullary ischemic reflex.
Introduction:
The vasoconstriction and vasodilation are collectively called as vasomotion. The narrowing of the vessel is called as vasoconstriction, and it occurs by contraction of smooth muscle in the tunica media. The widening of the vessel in vasodilation is by muscular passivity rather than muscular effort. The smooth muscles get relaxed, and the blood pressure allows the vessel to expand. The vasomotor center of the brain controls the vasomotion.
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Chapter 20 Solutions
LSC (CONCORDIA UNIV ST PAUL) BIO 315/316: B&N DPF Connect with APR and Phils Online Access for Anatomy and Physiology: The Unity of Form and Function 180 Day Access ENTRP
- Why arterial flow is pulsatile but capillaryand venous flow are notarrow_forwardHow pulmonary circulation differs fromsystemic circulation with respect to bloodpressure, capillary exchange, relative oxygenation of arterial and venous blood, andthe vasomotor response to hypoxiaarrow_forwardHow blood flow is related to resistance andpressure differences; the mathematical expression of these relationshipsarrow_forward
- How portal systems and anastomoses differfrom simpler routes of blood flow; types ofanastomoses and their purposesarrow_forwardA typical value for cerebral blood flow and why its constancy is importantarrow_forwardsignificance and mechanisms of systemic neural control of cerebral blood flowarrow_forward
- Which vessels contribute most to altered systemic blood pressure when their smooth muscles contract or dilate,large muscular arteries,small muscular arteries,or arteriolesarrow_forwardHistological description of the different types of blood vessels.arrow_forwardlocal direct control of blood flow through a tissuearrow_forward
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