PHYSIOLOGY
MUSCLE CONTRACTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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IN ORDER TO MOVE, MUSCLES MUST ONLY ____
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CONTRACT
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EXTEND
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Either A or B
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None of the above
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Explanation:
Detailed explanation-1: -Muscles can only contract. They cannot actively extend, or lengthen. Therefore, to move bones in opposite directions, pairs of muscles must work in opposition.
Detailed explanation-2: -Muscles are believed to contract through a process called the Sliding Filament Theory. In this theory, the muscles contract when actin filaments slide over myosin filaments resulting in a shortening of the length of the sarcomeres, and hence, a shortening of the muscle fibers.
There is 1 question to complete.