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Muscle

Smooth muscle...

Question

Smooth muscle fibres
I. are fusiform & uninucleated cells
II. Are involuntary in function
III. Do not perform slow and sustained contractions
IV. Do not show striations due to regular arrangement of actin and myosin filaments.
Choose the incorrect set of statements.

A

I & II

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B

III & IV

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C

II & III

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D

I & IV

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Solution

The correct option is B III & IV
Smooth muscle fibres perform slow and sustained contractions. Do not show striations due to irregular arrangement of actin and myosin filaments.

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Q. Assertion :Smooth muscle fibres do not appear to be striated. Reason: Striations occur due to regular alternate arrangement of thick and thin filaments in the smooth muscle fibre.

Q. Assertion :Smooth muscle fibres do not appear to be striated. Reason: This is due to regular alternate arrangement of thick and thin filaments is smooth muscle fibre.

Q. Choose the incorrect statements.

Statement 1: Striated muscles are also known as skeletal muscle.

Statement 2: Striated muscles show alternate light and dark bands.

Statement 3: Striated muscles are involuntary in nature.

Statement 4: Striated muscles are branched and uninucleated.

Q. Study the following and identify the incorrect statements
(i) Muscles of iris and ciliary body are smooth muscles of mesodermal origin
(ii) Slow and sustained involuntary contraction of smooth muscles are called spasms
(iii) Quiescent mononucleate myogenic cells of skeletal muscles are called pericytes
(iv) Skeletal muscles fibre is multinucleate and is a syncytium

Q. State whether the following statements are true or false.
Involuntary muscles have no myosin or actin since they lack striations.

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