Cardiac muscle: Difference between revisions
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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