MUSCLE
SKELETAL MUSCLE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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while one contracts, the other returns to original length
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both muscles contract at the same time
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both muscles relax at the same time
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1 muscle pulls on the bone and the other pulls on the first muscle
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Detailed explanation-1: -When one of them contracts, the bone is pulled in that direction and the other muscle of the pair relaxes. To move the bone in the opposite direction, the relaxed muscle contracts and the first one relaxes. Thus two muscles have to work together to move a bone.
Detailed explanation-2: -Muscles work in pairs: as one muscle contracts, the other relaxes. Muscles that work together like this are called antagonistic pairs. This type of action enables the body to move with stability and control. Examples of antagonistic pairs are: ⚫ Biceps and triceps-at the elbow joint.
Detailed explanation-3: -The Sliding Filament Model of Contraction When signaled by a motor neuron, a skeletal muscle fiber contracts as the thin filaments are pulled and then slide past the thick filaments within the fiber’s sarcomeres. This process is known as the sliding filament model of muscle contraction (Figure 10.10).