PHYSIOLOGY
NEUROMUSCULAR JUNCTION TRANSMISSION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The energy needed to perform a muscle contraction comes from:
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ATP
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Oxygen
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Calcium
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Sarcolemma
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Explanation:
Detailed explanation-1: -ATP enables the actin-myosin cross-bridge to detach, and release energy through its hydrolysis to enable the myosin head to return to its normal position.
Detailed explanation-2: -The energy is derived from adenosine triphosphate (ATP) present in muscles. Muscles tend to contain only limited quantities of ATP. When depleted, ATP needs to be resynthesized from other sources, namely creatine phosphate (CP) and muscle glycogen.
Detailed explanation-3: -Answer. Answer: One cycle of a single myosin ATPase head expends 1 molecule of ATP, but it takes thousands of these myosin heads, each producing about 5 power stroke per second (1 ATP/stroke), to produce a noticeable or useful contraction of the whole muscle.
There is 1 question to complete.