PHYSIOLOGY
MUSCLE CONTRACTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Lengthen
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Shorten
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Is completely or partially contracted without changing its length
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None of the above
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Detailed explanation-1: -Static exercise involves the contraction of skeletal muscle without a change in muscle length, hence the alternative term, isometric (iso = same, meter = length) exercise. Static exercise produces a cardiovascular response that differs significantly from that observed during dynamic exercise.
Detailed explanation-2: -When a muscle contracts, the actin is pulled along myosin toward the center of the sarcomere until the actin and myosin filaments are completely overlapped. In other words, for a muscle cell to contract, the sarcomere must shorten. However, thick and thin filaments-the components of sarcomeres-do not shorten.
Detailed explanation-3: -Isometric muscle contractions. This type of contraction is used when your muscle stays in a single position and the attached joint doesn’t move.