Select the correct pairing .

Options

A. Heart wall - Involuntary unstriated muscle
B. Biceps of the upper arm - Voluntary unstriated muscle
C. Abdominal wall - Involuntary striated muscle
D. lris - Involuntary unstriated muscle

Answer

To solve the question of selecting the correct pairing of muscle tissues, we will analyze each option provided in the question step by step.

### Step-by-Step Solution:

1. **Understanding Muscle Types**:
- There are three main types of muscle tissues:
- **Striated (Skeletal) Muscles**: These are voluntary muscles that have a striated appearance due to the arrangement of fibers.
- **Unstriated (Smooth) Muscles**: These are involuntary muscles that lack striations and have a smooth appearance.
- **Cardiac Muscles**: These are striated but involuntary muscles found only in the heart.

2. **Analyzing Each Option**:
- **Option 1: Heart Wall**
- The heart wall is made up of cardiac muscle, which is involuntary and striated.
- The pairing given is "involuntary striated," which is correct.
- **Conclusion**: This option is correct.

- **Option 2: Biceps of Upper Arm**
- The biceps are composed of striated (skeletal) muscle, which is voluntary.
- The pairing given is "voluntary unstriated," which is incorrect.
- **Conclusion**: This option is incorrect.

- **Option 3: Abdominal Wall**
- The abdominal wall consists of smooth (unstriated) muscle, which is involuntary.
- The pairing given is "involuntary unstriated," which is correct.
- **Conclusion**: This option is correct.

- **Option 4: Iris**
- The iris contains smooth muscle, which is unstriated and involuntary.
- The pairing given is "involuntary unstriated," which is correct.
- **Conclusion**: This option is correct.

3. **Final Evaluation**:
- After analyzing all options, we find that:
- Option 1 is correct (Heart Wall: involuntary striated).
- Option 2 is incorrect (Biceps: should be voluntary striated).
- Option 3 is correct (Abdominal Wall: involuntary unstriated).
- Option 4 is correct (Iris: involuntary unstriated).
- The only option that is completely correct in terms of the pairing is the first one.

### Final Answer:
The correct pairing is **Option 1: Heart Wall - Involuntary Striated**.