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

Iris - Involuntary smooth muscle

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Heart wall - Involuntary unstriated muscle

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Biceps of upper arm - smooth muscle fibers

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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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Similar questions

Which one of the following statement is incorrect?

(a) Heart muscles are striated and involuntary

(b) The muscles of hands and legs are striated and voluntary

(d) Muscles located in the reproductive tracts are unstriated and involuntary

Cardiac muscle is :
(a) Involuntary
(b) Smooth
(c) Striated
(d) Involuntary and Striated.

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