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Question
Which of the following phenomena occurs during muscular contraction?
Which of the following phenomena occurs during muscular contraction?
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Solution
The correct option is B ATP is broken down
During contraction of a muscle, calcium ions bind to troponin. This moves tropomyosin out of the way and uncovers binding sites for myosin on the myofilaments. Myosin has two binding sites - one for ATP and the other for actin. ATP molecule binds to the myosin head. The ATP is broken down to ADP and phosphate, releasing energy, which is stored in the myosin head and which is later used for binding of myosin and actin which leads to muscle contraction. So, the correct answer is option A.
During contraction of a muscle, calcium ions bind to troponin. This moves tropomyosin out of the way and uncovers binding sites for myosin on the myofilaments. Myosin has two binding sites - one for ATP and the other for actin. ATP molecule binds to the myosin head. The ATP is broken down to ADP and phosphate, releasing energy, which is stored in the myosin head and which is later used for binding of myosin and actin which leads to muscle contraction. So, the correct answer is option A.
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