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

Options

A. Abdominal wall Smooth muslce
B. Iris Involunatary smooth muscle
C. Heart wall Involunatary unstriated mucscle
D. Biceps of upper arm Smooth muscle fibres

Answer

To solve the question regarding the correct pairing of a body part and the kind of muscle tissue that moves it, we will analyze each option provided:

1. **Understanding Muscle Types**:
- **Skeletal Muscle**: These are voluntary muscles that are striated and attached to bones. They facilitate the movement of the skeleton.
- **Smooth Muscle**: These are involuntary muscles that are non-striated. They are found in the walls of hollow organs (like the stomach and blood vessels) and are responsible for involuntary movements.
- **Cardiac Muscle**: This type of muscle is found only in the heart. It is involuntary and striated, functioning to pump blood.

2. **Analyzing Each Option**:
- **Option A: Abdominal wall smooth muscle**: This is incorrect because the abdominal wall is made up of skeletal muscle, not smooth muscle.
- **Option B: Iris involuntary smooth muscle**: This is correct. The iris of the eye is made up of smooth muscle that controls the size of the pupil and is indeed involuntary.
- **Option C: Heart wall involuntary unstriated muscle**: This is incorrect. The heart wall consists of cardiac muscle, which is involuntary but striated, not unstriated.
- **Option D: Biceps of the upper arm smooth muscle fibers**: This is incorrect as the biceps are skeletal muscles, not smooth muscle fibers.

3. **Conclusion**:
- The correct pairing is **Option B: Iris involuntary smooth muscle**.