the answer is B but why option E is wrong? I thought the Na+ voltage gated channels will open at first since we are talking about depolarization, then the Ca++ ions will be released to SR.
Hey Lara! Check Lesson BIO-2, I explained the solution there.
It’s a very tricky question, both might be correct but B is just more accurate.
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okay, thanks Ari! I will definitely check out the lesson 
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