MUSCLE
SMOOTH MUSCLE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Ca2+ involved in contraction?
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Cardiac
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Smooth
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Skeletal
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None of the above
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Explanation:
Detailed explanation-1: -Ca2+ ions that are stored in the SR are released to the cytosol via the activated RyR1, where they bind to troponin C, which then activates a series of contractile proteins and induces skeletal muscle contraction.
Detailed explanation-2: -Skeletal muscle contraction is initiated by an increase in cytoplasmic Ca2+ concentration ([Ca2+]). This Ca2+ binds to troponin C, which permits actin-myosin interaction.
Detailed explanation-3: -Calcium triggers contraction by reaction with regulatory proteins that in the absence of calcium prevent interaction of actin and myosin. Two different regulatory systems are found in different muscles.
There is 1 question to complete.