MYTUTOR SUBJECT ANSWERS

239 views

What are the roles of the sinoatrial node (SAN) and the atrio-ventricular node (AVN)?

The heart muscle is myogenic and initiates a heartbeat through an electrical conduction system; both the sinoatrial node and atrio-ventricular node are essential in this mechanism.

The sinoatrial node (SAN) is a region of cardiac fibres located in the right atrium. The electrical wave of stimulation is initiated here and extends over the two atria, causing them to contract. It is often referred to as the pacemaker of the heart.

The atrioventricular node is a region of cardiac fibres located between the two atria. The electrical stimulation, initiated in the SAN, is transferred through this region to the ventricles.

(The excitation then passes down the Bundle of His, into branching Purkinje fibres, before reaching the ventricle walls and causing them to contract)

Shelby P. GCSE Biology tutor, A Level Biology tutor, GCSE Chemistry t...

5 months ago

Answered by Shelby, an A Level Biology tutor with MyTutor


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

145 SUBJECT SPECIALISTS

£20 /hr

Natalie C.

Degree: Natural Sciences (Bachelors) - Exeter University

Subjects offered: Biology, Maths+ 1 more

Biology
Maths
Chemistry

“Hi, My name is Natalie and I am currently studying BSc Natural Sciences at Exeter University. I have always had a passion for science, despite not knowing the exact career pathway that I would like to take and would hope that I can co...”

£20 /hr

Hilary L.

Degree: Veterinary Medicine & Surgery (Bachelors) - Glasgow University

Subjects offered: Biology, Chemistry+ 1 more

Biology
Chemistry
-Personal Statements-

“Hello! I'm Hilary, a 1st year veterinary student at the University of Glasgow. I am a recent May 2016 IB diploma graduate, attaining a total of 40 points with a 7 in HL biology. This means that I am familiar with the recent change of t...”

MyTutor guarantee

£22 /hr

Runzhi C.

Degree: Medicine (Bachelors) - Imperial College London University

Subjects offered: Biology, Maths+ 3 more

Biology
Maths
Chemistry
-Personal Statements-
-Medical School Preparation-

“Hi there, I am a first year medical student at Imperial College London and I have lived in the UK all my life. I enjoy studying medicine because it encompasses both scientific knowledge and social aspects. I am relatively new to tutor...”

About the author

£30 /hr

Shelby P.

Degree: Veterinary Science (Bachelors) - Bristol University

Subjects offered: Biology, Maths+ 2 more

Biology
Maths
Human Biology
Chemistry

“About Me: I am a post-graduate veterinary student in my fourth year at Bristol Univeristy. I graduated from Bristol in 2013 with a First Class Honours in Biological Sciences before starting another degree in Veterinary Sciences so it...”

You may also like...

Other A Level Biology questions

Describe how negative feedback is used to control blood glucose concentration (6 marks)

What is a mutation and what are the consequences of one?

Describe 3 differences between mitosis and meiosis

What is another model for enzyme activity?

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