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. 
 

DY
Answered by Dharani Y. Biology tutor

41417 Views

See similar Biology A Level tutors

Related Biology A Level answers

All answers ▸

How is blood glucose controlled in homeostasis?


Describe the processes involved in the absorption of the products of starch digestion


What is the function of the Loop of Henle?


Describe and explain how air enters the lungs during inspiration


We're here to help

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

MyTutor is part of the IXL family of brands:

© 2025 by IXL Learning