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.

JA
Answered by Jack A. Biology tutor

2318 Views

See similar Biology A Level tutors

Related Biology A Level answers

All answers ▸

How do I answer a question asking me to describe and/or explain a graph?


What is negative feedback?


How does a white blood cell ingest and kill a bacteria?


Describe and explain the process by which proteins are created from DNA


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