Control of the Heart rate
- Created by: Jessica
- Created on: 04-11-12 17:48
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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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