During Skeletal Muscle Contraction, Multiple Crossbridge Cycles Are Occurring Between

question 103

Multiple Choice

During skeletal muscle contraction, multiple crossbridge cycles are occurring between the same thick and thin filament. Which of the following best describes this process?

• A) No more than one myosin head detaches from the thin filament at the same time.
• B) Tropomyosin only exposes one binding site on actin at a time allowing only one crossbridge to form with actin at a given time.
• C) No more than one myosin head links to the thin filament at the same time.
• D) Crossbridge cycling is highly synchronized between a certain thick and thin filament.
• E) Crossbridge cycling is asynchronous between a certain thick and thin filament.

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Definitions:

Joint Contracture

A permanent shortening of a muscle or joint, limiting movement and potentially causing deformity and rigidity.

Quadriplegic

A condition in which an individual has paralysis in all four limbs, typically resulting from injury or illness affecting the spinal cord.

ROM

The complete movement capacity of a joint, typically encompassing its ability to flex and extend.

Osteoporosis

A bone disease characterized by decreased bone mass and density, leading to an increased risk of fractures.