What events occur during the cardiac cycle?

Within the heart the atria contract creating a high pressure and squeezing blood into the ventricles. The semi lunar valves are closed so pressure within the ventricles builds up.Pressure within the ventricles becomes greater than in the atria which closes the atrioventricular valves. The cardiac muscle of the ventricle walls contract which causes the pressure in the ventricles to exceed the pressure within the atria and pulmonary artery forcing the semi lunar valves to open and expelling blood from the heart.

James H. GCSE Biology tutor, A Level Biology tutor, GCSE English tutor

4 months ago

Answered by James, an A Level Biology tutor with MyTutor

Still stuck? Get one-to-one help from a personally interviewed subject specialist


£20 /hr

Victoria S.

Degree: Physiology (Bachelors) - Liverpool University

Subjects offered: Biology, Maths


“About me:Hey! My name is Tory and I am in my second year studying Physiology in the School of Life Sciences at The University of Liverpool. After completing my current degree, I hope undertake a Graduate-entry Medicine course to furt...”

£20 /hr

Hugh S.

Degree: Medicine (Other) - Liverpool University

Subjects offered: Biology, Human Biology+ 2 more

Human Biology
-Personal Statements-
-Medical School Preparation-

“Hi there, my name's Hugh. I'm currently training to be a Doctor at the University of Liverpool. This is my second degree having done my bachelors in Physiology at the University of Bristol getting a 2:1. It may surprise you that I did...”

MyTutor guarantee

£20 /hr

Ollie F.

Degree: Biochemistry (Bachelors) - Bristol University

Subjects offered: Biology, Science+ 5 more

Extended Project Qualification
-Personal Statements-

“A little bit about me: I'm a Biochemistry student at Bristol University. I've always been facinated with how the world world works both on a smaller and larger scale. The human body has always been an interest of mine, in particular h...”

About the author

£20 /hr

James H.

Degree: Biology (Bachelors) - Bristol University

Subjects offered: Biology, English


“Top tutor from the renowned Russell university group, ready to help you improve your grades.”

MyTutor guarantee

You may also like...

Other A Level Biology questions

What are the methods of immobilising enzymes?

What is alternative splicing

Describe the process of translation in protein synthesis

Why is lactic acid produced during anaerobic respiration?

View A Level Biology tutors


We use cookies to improve our service. By continuing to use this website, we'll assume that you're OK with this. Dismiss