Origin of heartbeat and conduction pathway?
Answer (1)
10th Mar, 2019
Origin of heartbeat - SAN (Sino-atrial Node)/Pacemaker
Conduction Pathway -
SAN (Sino-atrial Node)/Pacemaker ---> AVN (Atrio-ventricular Node)/Pacesetter ---> AV bundle (Atro-ventricular bundle) ---> Bundle of His ---> Purkinje Fibres
Remember that although all the heart muscles have the ability to generate impulses that trigger cardiac contractions, the SAN initiates it, as it generates the max number of action potentials (70-75 per minute), and is responsible for initiating and maintaining the rhythmic contractile activity of the heart.
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