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5 Cards in this Set
- Front
- Back
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True or false: Cardiac muscles are like any striated muscle they have mechanical and electrical coupling.
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False: mechanical and electrical coupling is unique to Cardiac muscles.
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True or false: the fast action potential phases are:
phase 0: sodium enters. Phase 1: sodium channels are inactivated. calcium enters. Phase 2: calcium entering the cell potassium exiting. Phase 3: only voltage gated potassium channels are open and re polarization is happening. Phase 4: back to resting membrane potential. |
True.
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True or false: the refractory period in heart muscles is 0-180 msec.
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False: it is the absolute refractory period.
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True or false: the relative refractory period in the heart muscles is 180-200 msec.
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True.
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True or false: the heart muscle can't have fused tetanus because it contracts in unison.
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False: it can't have fused tetanus because the action potential and the twitch duration is almost the same duration.
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