23 Regulation of bloodflow - Biology141 (Physiology) 4/6/08...

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4/6/08 1:05 AM Biology141 (Physiology) Page 1 of 4 https://courses.bio.psu.edu/spring2008/biol141/Lecture%2023(2008).htm Biology141 (Physiology) Lecture 23 M. Whim REGULATION OF BLOOD FLOW [1]. GENERAL CONCEPTS. take a look at the material posted online about arteries, veins and capillaries. blood flow is related to the resistance to flow in the small arteries that serve an organ. blood flow α P(r 4 ). P = pressure difference between the ends of the vessel r = radius of vessel why does vasoconstriction / vasodilation have such a large effect on blood flow? blood flow is regulated by extrinsic, paracrine and intrinsic mechanisms: [2]. EXTRINSIC REGULATION OF BLOOD FLOW. extrinsic means control by the autonomic nervous system and the endocrine system. (a). Regulation by the sympathetic nervous system. activation increase in cardiac output (last lecture). activation produces an increase in total peripheral resistance (due to vasoconstriction of arterioles in viscera and skin). (b). Regulation by the parasympathetic nervous system.
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This note was uploaded on 04/05/2008 for the course BIOL 141 taught by Professor Viti,janehartwel during the Spring '08 term at Pennsylvania State University, University Park.

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23 Regulation of bloodflow - Biology141 (Physiology) 4/6/08...

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