Control of the Heart rate

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How a heart beat is initiated: 

·         Heart is myogenic

·         SAN is the hearts pacemaker, it initiates its own action potential which travels as a wave of excitation over the atria walls.

·         It reaches the AVN and travels down the Purkyne tissue, into the ventricles causing them to contract. 

·         The heart is supplied by nerves from the medulla oblongata, which are connected to the SAN. This controls the frequency of contraction.

 How the heart rate is increased:

·         Increased activity is detected by stretch receptors

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