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Question

A characteristic feature of the muscle fibre is the presence of large number of parallelly arranged filaments in the sarcoplasm called


A

Microfilaments

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B

Myofibrils

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C

Microtubules

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D

Both a and c

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Solution

The correct option is D

Both a and c


Muscle fibres

The muscles are made up of muscle bundles in which the muscle fibres are arranged parallelly.

The muscle fibres are made up of myofibrils. The muscle cell is covered by sarcolemma inside which is present the sarcoplasm. The myofibrils have myofilaments inside. They are arranged parallel to each other

There are thick (myosin) and thin filaments (actin) that slide onto each other. The protein (actin) contributing to the myofilaments belong to the group of cytoskeletal proteins - microfilaments.

The myofilaments are arranged in a functional unit known as sarcomere.

Final answer

D) Both A and C


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