Which one of the following is the correct pairing of a body part and the kind of muscle tissue that moves it?
Which one of the following is the correct pairing of a body part and the kind of muscle tissue that moves it?
Heart wall - Involuntary unstriated muscle
Biceps of upper arm - Smooth muscle fibres
Abdominal wall - Smooth muscle
Iris - Involuntary smooth muscle
Solution
Smooth muscles are plain, non-striated, involuntary or unstriped muscles due to absence of striations. These occur in the walls of hollow internal organs, in capsules of lymph glands, spleen etc, in iris and ciliary body of eyes, skin dermis, penis and other accessory genitalia etc.