Physiology Exam 1: -change in membrane potential allows Ca2+ entry
-generation of IP3 @ cell membrane can open intracellular SR Ca2+ stores
--either of these can cause SR to open Ca2+ channels
-when this depletes Ca2+ stores in SR it signals to allow Ca2+ in from ECF to refill

Question

-change in membrane potential allows Ca2+ entry
-generation of IP3 @ cell membrane can open intracellular  SR Ca2+ stores 
--either of these can cause SR to open Ca2+ channels 
-when this depletes Ca2+ stores in SR it signals to allow Ca2+ in from ECF to refill

Emma Grace Goldman · Accepted Answer

how can some smooth m contract without an AP?

Physiology Exam 1

-change in membrane potential allows Ca2+ entry -generation of IP3 @ cell membrane can open intracellular SR Ca2+ stores --either of these can cause SR to open Ca2+ channels -when this depletes Ca2+ stores in SR it signals to allow Ca2+ in from ECF to refill

How can some smooth m contract without an AP?

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