Describe how a heartbeat is initiated and coordinated?

The sinoatrial node (SAN) sends a wave of electrical activity across the atria causing atrial contraction. The non-conducting tissue stops the immediate contraction of the ventricles. The atrioventricular node (AVN) delays the impulse whilst the blood leaves the atria and fills the ventricles. After the ventricle fills, the AVN sends a wave of electrical activity down the Bundle of His which causes the ventricles to contract from the base up. 
 

Answered by Dharani Y. Biology tutor

34625 Views

See similar Biology A Level tutors

Related Biology A Level answers

All answers ▸

Name the three components that make up a nucleotide


Describe the similarities and differences between ultrafiltration in the kidneys and the formation of tissue fluid.


What are the advantages of saltatory conduction?


How does the lac operon work?


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