Describe the pathway of electrical activity in the heart during the cardiac cycle.

The wave of excitation originates in the sinoatrial node in the right atrium. From there, it travels through the right and left atria, causing contraction of the atria (atrial systole). It is prevented from travelling further by the atrioventricular node.From the atrioventricular node the wave travels down the septum through the bundle of His and then splits and travels up through the Purkinje fibres, causing contraction of the ventricles (ventricular systole).

JW
Answered by Josh W. Biology tutor

2785 Views

See similar Biology A Level tutors

Related Biology A Level answers

All answers ▸

What are the different stages of Mitosis?


Why does oxygen bind to haemoglobin easier the second time?


Describe the structure of proteins


When do mutations not cause a change in amino acid sequence?


We're here to help

contact us iconContact ustelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences