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

1806 Views

See similar Biology A Level tutors

Related Biology A Level answers

All answers ▸

What is the most important function of mitochondria?


How does temperature effect enzymes?


Describe the process that converts a genetic sequence on messenger RNA into the primary sequence of a protein


How are the alveoli adapted to allow efficient gas exchange within the lungs?


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 2013–2024

Terms & Conditions|Privacy Policy
Cookie Preferences