If Na⁺ Cannot Enter a Muscle Fiber in Response to a Stimulus

question 188

Multiple Choice

If Na⁺ cannot enter a muscle fiber in response to a stimulus,

• A) contraction cannot occur.
• B) relaxation cannot occur.
• C) Na⁺ will be released from the sarcoplasmic reticulum instead.
• D) the active sites are left exposed.
• E) the action potential travels into the muscle anyway.

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