NEET2009ZoologyStructural Organisation in AnimalsActual
Which one of the following is the correct pairing of a body part and the kind of muscle tissue that moves it?
Options
- AHeart wall - Involuntary unstriated muscle
- BBiceps of upper arm - Smooth muscle fibres
- CAbdominal wall - Smooth muscle
- DIris - Involuntary smooth muscle
Correct answer
D. Iris - Involuntary smooth muscle
Step-by-step 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.