How do electrical impulses control contraction of the heart?

Electrical impulses from the SAN (sinoatrial node) spread across the atria walls to cause contraction. The impulses then pass to the ventricles via the AVN (atrioventricular node) after a short delay to allow time for the atria to fully contract. These impulses then pass down the purkyne fibres to the heart apex. They then spread up through the ventricle walls to cause contraction from the apex upwards. Blood is squeezed into the arteries as a result.

Answered by Jack A. Biology tutor

2154 Views

See similar Biology A Level tutors

Related Biology A Level answers

All answers ▸

How to write an essay on: The importance of proteins in the control of processes and responses in organisms.


What is the phospholipid bilayer?


Describe what can be used to determine the time of death of a corpse


Describe the process of an action potential travelling across a synapse


We're here to help

contact us iconContact usWhatsapp logoMessage us on Whatsapptelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences