iphy 3430 3-1-11

iphy 3430 3-1-11 - IPHY 3430 3-1-11 Heart Function Purpose:...

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IPHY 3430 3-1-11
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Heart Function Purpose: generates a hydrostatic pressure gradient that causes blood to flow Specialized muscle cells--functional syncytium
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Contraction of cardiac muscle The increase in Ca++ in the cell causes muscle contraction. . (and we ll pick up the rest of the story when we get to muscles after spring break)
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Control of heart rate SNS releases norepinephrine on pacemaker cells--> HR by increasing the rate of depolarization by decreasing K+ permeability of pacemaker cells--therefore, cell less negative and it takes less time to reach threshold
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Control of heart rate PNS releases acetylcholine on the pacemaker --> HR by decreasing the rate of depolarization by increasing the K+ permeability of pacemaker cells--therefore, cell more negative and it takes longer to reach threshold
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[includes heart disease (myocardial infarction) and stroke] What were top 3 causes of adult deaths in 1900? What were top 3 causes of adult deaths in 1990?
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This note was uploaded on 02/23/2011 for the course IPHY 3430 taught by Professor Lynch,robe during the Spring '08 term at Colorado.

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iphy 3430 3-1-11 - IPHY 3430 3-1-11 Heart Function Purpose:...

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