Question

A skeletal muscle is a composition of several components bundled one into the other. At which structural level in the muscle does contraction occur to bring about contraction in the whole muscle?
A. myofibril
B. muscle fiber
C. myoneural junction
D. tendon
E. fascicle

Answer 1

B. muscle fiber would be the answer

Answer 2

Answer:

Muscle contraction occur to bring about contraction in the whole muscle at myofibril level.

Explanation:

• Skeletal muscle tissue develops into skeletal muscles, which connect to bones or skin and regulate movement that can be consciously controlled as well as locomotion.
• Skeletal muscle is also referred to as voluntary muscle because it may be directed by mind.
• Skeletal muscles are long and cylindrical in shape, and their tissue appears striped or striated when seen under a microscope.

• The sarcolemma is the name for a skeletal muscle fiber's plasma membrane.
• Action potential conduction, which causes muscle contraction, occurs in the sarcolemma.
• Myofibrils, which are protracted cylindrical structures that run parallel to muscle fibers, are found inside each muscle fiber.
• Since myofibrils only have a diameter of around 1.2 m over their whole length, one muscle fiber can contain hundreds to thousands of them.
• They connect to the sarcolemma at their ends, causing the entire muscle cell to contract as the myofibrils shorten.

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