객관식
True or false: if false, choose the answer that best corrects the statement:
The motor neuron is in contact with the sarcolemma in order to efficiently pass the electrical signal to the muscle fiber.
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9. Muscle Tissue
Steps of Muscle Contraction
객관식
Which part of the cross-bridge cycle is called the power stroke?
A
Cocking of the myosin head.
B
ATP hydrolysis.
C
Myosin pulling the actin.
D
Binding of myosin heads to actin.
검증된 단계별 안내1
Understand the cross-bridge cycle: The cross-bridge cycle is a series of molecular events that occur after excitation of the muscle fiber, leading to muscle contraction.
Identify the key stages of the cycle: The main stages include the binding of myosin to actin, the power stroke, the detachment of myosin from actin, and the re-cocking of the myosin head.
Define the power stroke: The power stroke is the phase where the myosin head pivots and pulls the actin filament toward the center of the sarcomere, which is crucial for muscle contraction.
Differentiate between the stages: The power stroke specifically refers to the action of myosin pulling actin, not the binding or detachment phases.
Relate the power stroke to muscle contraction: This step is essential for the sliding filament theory, where actin and myosin filaments slide past each other, shortening the muscle fiber and generating force.
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