dxtxpx
Forum Guru
Topics: 259
Posts: 1,233
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C :?:
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| auubar
Forum Senior
Topics: 30
Posts: 182
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sorry it is typing error I will also choose C.
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| anne
Forum Elite
Topics: 41
Posts: 348
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all muscles require Ca from sarcoplasmic reticulum as source of Ca,but skeletal muscles dont rely on Ca from any external source as ECf and so rely only on sarcoplasmic reticulum for Ca ,as opposed to cardiac and smooth muscles. so :?:
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| kris2c
Forum Senior
Topics: 30
Posts: 108
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8) Answer: c
The flux of EC Ca++ that occurs in cardiac m. corresponds to plateau phase (Phase 2) of the cardiac Axn pot.
Blocking fast Na channels will prevent skeletal muscle contraction, but cardiac muscle also have slow Na channels which can depolarize the cell. Cardiac m. spontaneously depolarize and are electrically coupled to each other.
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Kris2c
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