Which one has alternate striations and is correctly matched ?

Options

A. Biceps under autonomous control
B. Iris muscles under control of will
C. Heart muscles , involuntary
D. Muscles of visceral organs under autonomous control .

Answer

To solve the question "Which one has alternate striations and is correctly matched?", we will analyze the options provided and identify the muscle type that fits the description of having alternate striations.

### Step-by-Step Solution:

1. **Understanding Muscle Types**:
- There are three types of muscles in the human body: skeletal, smooth, and cardiac.
- Skeletal muscles are striated and under voluntary control, while smooth muscles are non-striated and involuntary. Cardiac muscles are also striated but involuntary.

2. **Analyzing the Options**:
- **Biceps under autonomous control**: Biceps are skeletal muscles, which are striated but under voluntary control, not autonomous.
- **Iris muscles under the control of will**: The iris muscles are smooth muscles, which are involuntary and not under conscious control, thus this option is incorrect.
- **Heart muscles involuntary**: Heart muscles, also known as cardiac muscles, are striated and involuntary. They have alternate striations due to the arrangement of actin and myosin filaments.
- **Muscles of visceral organs under autonomous control**: These are smooth muscles, which are not striated and are also involuntary, making this option incorrect.

3. **Identifying the Correct Answer**:
- The only option that describes a muscle type with alternate striations and is correctly matched is the **heart muscles**, which are involuntary and striated.

4. **Conclusion**:
- Therefore, the correct answer to the question is **heart muscles** (cardiac muscles).

### Final Answer:
**Heart muscles (cardiac muscles) involuntary.**

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