Heart - Control Of Cardiac Cycle

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  • Heart Muscle can initiate its own contraction, so it is described as myogenic.
  • Muscle can contract and relax even when its not connected to its own body.
  • Atrial muscle tends to contract at a higher frequency than the ventricular muscle.
  • At the top of the Right Atrium , is the Sinoatrial Node (SAN), which is a tiny patch of tissue that generates electrical activity. SAN initiates a wave of excitation. SAN is also known as the pacemaker.
  • This wave of excitation quickly spreads over both atria, as wave of excitation passes, it causes cardiac muscle…

Comments

MJ

Nice and simply worded, great for revising heart control in A2.

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