MYTUTOR SUBJECT ANSWERS

107 views

What are the events in the cardiac cycle?

The cardiac cycle is the series of events that leads to blood being pumped to the lungs and around the body.

The cycle begins with the SAN (sino-atrial node). This is the hearts 'pacemaker'. It sends out a nerve impulse which spreads over the atria and causes them to contract (atria systole), forcing blood into the ventricals. The signal is not able to spread to the ventricals as a layer of non-connective tissue blocks the signal at the base of the atria.

The signal from the SAN is recieved at the AVN (atrio-ventricular node) at the top of the ventricals. This node sends a signal down the perkyne (or purkinje) fibres which travel in the insulating Bundle of His through the inter-ventrica septum to the base of the ventricles.

At the base of the ventricals (apex) a wave of contraction passes up the ventricals causing them to contract pushing blood up and out of the ventricals.

These events can be tracked on an ECG trace.

Thomas C. GCSE Biology tutor, A Level Biology tutor, GCSE Chemistry t...

3 months ago

Answered by Thomas, an A Level Biology tutor with MyTutor

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

132 SUBJECT SPECIALISTS

£20 /hr

Firat G.

Degree: Biochemistry (Bachelors) - Bristol University

Subjects offered: Biology, Economics+ 1 more

Biology
Economics
Chemistry

“Currently, I am studying Medicinal Biochemistry at the University of Bristol. I tutor numerous students at both GCSE and A level and thoroughly enjoy being able to help individuals improve their confidence and understanding of Biology ...”

£20 /hr

Sarah P.

Degree: Biology (Bachelors) - York University

Subjects offered: Biology

Biology

“I study Biology at the University of York and look forward to helping you to understand your Biology course, for upcoming GCSE and A-Level exams!”

£20 /hr

Raj K.

Degree: Medicine (Bachelors) - Liverpool University

Subjects offered: Biology, Science+ 4 more

Biology
Science
Physics
Maths
French
Chemistry

“About Me: I am a medical student at The University of Liverpool and have already completed a degree in Biochemistry at the University of Manchester. Hopefully, it goes without saying that it is clear that I love science and am hugely ...”

MyTutor guarantee

About the author

Thomas C.

Currently unavailable: for new students

Degree: Dentistry (Bachelors) - Cardiff University

Subjects offered: Biology, Chemistry+ 1 more

Biology
Chemistry
-Personal Statements-

“About me Hey! It’s nice to meet you! My name is Tom, I’m 21 and I’m a 4th year Dental student at Cardiff. I love all things Science and I love telling other people all about Science so tutoring suits me down to the ground! I’m very pa...”

You may also like...

Posts by Thomas

How do white blood cells protect us from infection?

What are the events in the cardiac cycle?

What is the difference between oxidation and reduction?

Other A Level Biology questions

What is active transport and how is it used in the absorption of glucose?

What is cancer?

What is a randomised controlled trial?

What is division of labour within a cell?

View A Level Biology tutors

Cookies:

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

mtw:mercury1:status:ok