MYTUTOR SUBJECT ANSWERS

168 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...

4 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

123 SUBJECT SPECIALISTS

£20 /hr

Devajit D.

Degree: Medicine (Bachelors) - University College London University

Subjects offered: Biology, Chemistry+ 2 more

Biology
Chemistry
-Personal Statements-
-Medical School Preparation-

“Who am I? My name is Devajit Das, but you can call me Dev. I’m currently a first year medical student at UCL, having studied biology, chemistry and business studies at A-level. I’ve always been curious of these sciences and I hope I c...”

MyTutor guarantee

£20 /hr

Charlotte C.

Degree: Biological Sciences (Masters) - Durham University

Subjects offered: Biology

Biology

“Hi! If you're looking at my profile, you're probably finding Biology a bit tricky and just need a hand understanding some of the (admittedly complicated!) parts of the course. You'll be relieved to hear that I was once in your shoes -...”

£22 /hr

Elizabeth L.

Degree: Veterinary Science (Bachelors) - Bristol University

Subjects offered: Biology, Science+ 5 more

Biology
Science
Maths
German
Chemistry
.BMAT (BioMedical Admissions)
-Personal Statements-

“All About Me:  I am currently studying Veterinary Science at the University of Bristol. My love of science and the desire to work with people and animals means that I thoroughly enjoy my course. I have had part time jobs working with...”

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 are the differences between involuntary, cardiac and voluntary muscle?

Describe the process of translation in protein synthesis

What is homeostasis?

How is meiosis different to mitosis?

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