Tuesday, 10 July 2012

- How Adrenaline and Acetylcholine Affect Heart Rate?

How Adrenaline and Acetylcholine Affect Heart Rate?  
This video discusses the effect of Adrenaline and Acetylcholine on heart rate.


 Adrenaline speeds it up and Acetylcholine slows it down.

 They both have their effect by modifying the conductance for ions such as Sodium, Potassium and Calcium across the membrane of the cells of the SA node. 

 Adrenaline: increase the influx of Sodium and Calcium across the membrane of the cells of the SA node leading to faster heart rate.

Acetylcholine:increase the efflux of Potassium across the membrane of the cells of the SA node leading to slower heart rate.

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