Cardiac muscle

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IB Biology Higher Level Revision Guide 2009 syllabus  
 
IB Biology Higher Level Revision Guide 2009 syllabus  
  
Ashby Merson-Davies
+
Ashby Merson-Davies  
  
Oxford IB Revision Guides
+
Oxford IB Revision Guides  
  
 
2007
 
2007

Revision as of 22:41, 1 December 2011

Cardiac Muscle cells are striated, just as in skeletal muscle and is found only in the heart. It works on a rhythmn set by a group of pacemaker cells locted in the right atrium of the heart. This self-automated contraction property is called being 'myogenic'.

The Pacemaker releases an electrical impulse approximately 70 times per minute, which causes the heart to contract. The signals are sent via the involuntary nerves from the cardia control centre loacted in the medulla of the brain.


The rate of impulses can be increased by the cardiac accelerator nerve, or by the hormone adrenalin.

The rate of impulses can be decreased by the cardiac depressor nerve.



[1] BBC.co.uk

IB Biology Higher Level Revision Guide 2009 syllabus

Ashby Merson-Davies

Oxford IB Revision Guides

2007


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