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

Options

A. Iris - Involuntary smooth muscle
B. Heart wall - involuntry unstriated muscle
C. Biceps of upper arm - Smooth muscle fibres
D. Abdominal wall - smooth muscle

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 in the question.

### Step-by-Step Solution:

1. **Understand the Types of Muscle Tissue**:
- There are three types of muscle tissues in the body:
- **Skeletal Muscle**: Voluntary and striated (e.g., biceps, abdominal wall).
- **Cardiac Muscle**: Involuntary and striated (e.g., heart).
- **Smooth Muscle**: Involuntary and non-striated (e.g., iris of the eye, walls of hollow organs).

2. **Evaluate Each Option**:
- **Option 1: Iris** - The iris is responsible for controlling the size of the pupil and is made of smooth muscle tissue. This is an involuntary muscle, meaning it operates without conscious control.
- **Option 2: Heart** - The heart is made up of cardiac muscle, which is involuntary and striated. The description in the option is incorrect as it states "unstriated."
- **Option 3: Biceps of Upper Arm** - The biceps are composed of skeletal muscle, which is striated and voluntary. The option incorrectly states that it is made up of smooth muscle fibers.
- **Option 4: Abdominal Wall** - The abdominal wall is primarily made of skeletal muscle, which is striated and voluntary. The option incorrectly states that it is made up of smooth muscle cells.

3. **Identify the Correct Pairing**:
- After evaluating all options, the first option (Iris) is the only correct pairing. The iris is indeed made up of smooth muscle tissue and is involuntary.

### Conclusion:
The correct answer is **Option 1: Iris**, which is made up of smooth muscle tissue and is involuntary.

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