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Cardiovascular Physiology, Pace of SA node can be controlled by the…
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Pace of SA node can be controlled by the body's nervous system, or the cardiovascular control centre.
Autorhythmic or Pacemaker Cells
- Sinoatrial (SA) Node
- 70 to 80 AP per min (rate of action potential generation)
- Can be regulated by nervous system
- P Wave
- Atrioventricular (AV) Node
- Atrioventricular Bundle or Bundle of His and
- Purkinje fibres
In the autorhythmic cells
- Action Potential
- Pacemaker Potential (auto rhythmicity)
- Involvement of calcium
- Funny channel, results in opening of calcium
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Ischemia is a condition in which the blood flow (and thus oxygen) is restricted or reduced in a part of the body
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Action Potential of Contractile Cells
- Plateau phase of action potential allows long refractory period, prevents tetanic contraction (sustained muscle contraction) of the heart muscle
- Plateau happens because of the opening of the L-type Ca2+ channel.
Cardiac Murmur
- Happens when valves are not functioning properly