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Question

Which one of the following is correct pairing of a body part and the kind of muscle tissue that moves it ?

A
Iris - Involuntary smooth muscle
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B
Heart wall - Involuntary unstriated muscle
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C
Biceps of upper arm - smooth muscle fibers
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D
Abdominal wall - smooth muscle
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Solution

The correct option is A Iris - Involuntary smooth muscle
A. Iris Involuntary smooth muscle
EXPLANATION: Smooth muscle is involuntary. It works as single-unit smooth muscle and also as multi-unit smooth muscle. In the areas of single-unit smooth muscle all the cells contract together at the same time. This can be observed in stomach and bladder contraction. In multi-unit smooth muscle a portion of the cells in a region are contracted and this can be observed in the iris and ciliary muscle of eye.

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