PHYSIOLOGY
EXCITATION CONTRACTION COUPLING
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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When the heads of myosin myofilaments are linked to binding sites on Actin filaments
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z discs
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muscle relaxation
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cross bridges
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muscle excitation
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Explanation:
Detailed explanation-1: -The motion of muscle shortening occurs as myosin heads bind to actin and pull the actin inwards. This action requires energy, which is provided by ATP. Myosin binds to actin at a binding site on the globular actin protein.
Detailed explanation-2: -Actin is a thin contractile protein found in the muscle cells, whereas myosin is a thick contractile protein found in muscle cells. The heads of actin and myosin form a cross-bridge, generating muscle contraction. Muscle contraction occurs when the thin actin and thick myosin filaments slide past each other.
Detailed explanation-3: -Cross bridge cycling ends when ATP binds to the myosin head.
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