HUMAN PHYSIOLOGY
LOCOMOTION AND MOVEMENT
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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____ contracts and relaxes to produce movement.
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bones
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tendons
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muscles
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toes
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Explanation:
Detailed explanation-1: -Muscles move body parts by contracting and then relaxing.
Detailed explanation-2: -Muscle contraction and relaxation are controlled by the intrafiber free Ca++ concentration, [Ca++]i, in the myoplasm which bathes the muscle filaments of the sarcomeres. In turn, the [Ca++]i is controlled by a network of membranes which regulate and coordinate the process in time and space.
Detailed explanation-3: -Relaxation of a Skeletal Muscle ATP-driven pumps will move Ca++ out of the sarcoplasm back into the SR. This results in the “reshielding” of the actin-binding sites on the thin filaments. Without the ability to form cross-bridges between the thin and thick filaments, the muscle fiber loses its tension and relaxes.
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