MUSCLE PHYSIOLOGY

PHYSIOLOGY

MUSCLE CONTRACTION

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Which is more true to cause muscle contraction?
A
Actin Pulls on the myosin
B
Myosin Pulls on the Titin
C
Myosin Pulls on Actin
D
Actin Pulls on Titin
Explanation: 

Detailed explanation-1: -Muscle contraction thus results from an interaction between the actin and myosin filaments that generates their movement relative to one another. The molecular basis for this interaction is the binding of myosin to actin filaments, allowing myosin to function as a motor that drives filament sliding.

Detailed explanation-2: -Myosin pulls on actin filaments by performing a power stroke, in which the head of the molecule cocks itself backward. To perform this movement, myosin must use energy from adenosine triphosphate (ATP). It does so by acting as an ATPase, which causes the hydrolysis of ATP to form adenosine diphosphate (ADP).

Detailed explanation-3: -In summary, myosin is a motor protein most notably involved in muscle contraction. Actin is a spherical protein that forms filaments, which are involved in muscle contraction and other important cellular processes.

Detailed explanation-4: -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.

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