Which one of the following is correct pairing of a body part and like kind of muscle tissue that moves it?
Which one of the following is correct pairing of a body part and like kind of muscle tissue that moves it?
Iris - Involuntary smooth muscle
Heart wall - Involuntary unstriated muscle
Biceps of upper arm - smooth muscle fibres
Abdominal wall - smooth muscle
Solution
Explanation:
The iris is controlled by involuntary smooth muscle, which helps regulate the amount of light entering the eye by adjusting the size of the pupil.
Other options:
Heart wall: The heart wall is made of cardiac muscle, not unstriated muscle.
Biceps of upper arm: The biceps are made of skeletal muscle, not smooth muscle fibers.
Abdominal wall: The abdominal wall is made of skeletal muscle, not smooth muscle.
Thus, Iris - Involuntary smooth muscle is the correct pairing.