Which of the following muscles are known to be involuntary, branched and striated?

Options

A. Skeletal muscle
B. Smooth muscle
C. Cardiac muscle
D. Both (a) and (c)

Answer

To solve the question "Which of the following muscles are known to be involuntary, branched and striated?", we will analyze the characteristics of each type of muscle mentioned in the options provided.

### Step-by-Step Solution:

1. **Understanding Muscle Types**:
- There are three main types of muscles in the human body: skeletal, smooth, and cardiac.

2. **Defining Key Terms**:
- **Involuntary**: Muscles that operate without conscious control.
- **Branched**: Muscle fibers that have multiple branches.
- **Striated**: Muscle fibers that have a banded appearance due to the arrangement of actin and myosin filaments.

3. **Analyzing Each Option**:
- **Option A: Skeletal Muscle**:
- Skeletal muscles are **voluntary**, which means we can control their movements.
- They are **striated** but **unbranched** (cylindrical in shape).
- **Conclusion**: Not the correct answer.

- **Option B: Smooth Muscle**:
- Smooth muscles are **involuntary** and **unstriated**.
- They are also **unbranched** (spindle-shaped).
- **Conclusion**: Not the correct answer.

- **Option C: Cardiac Muscle**:
- Cardiac muscles are **involuntary** and **striated**.
- They are **branched**, allowing for a network of muscle fibers that can contract together.
- **Conclusion**: This matches the criteria of being involuntary, branched, and striated.

- **Option D: Both A and C**:
- Since skeletal muscle is not involuntary and is unbranched, this option cannot be correct.

4. **Final Answer**:
- The only muscle type that is involuntary, branched, and striated is **Cardiac Muscle**.

### Conclusion:
The answer to the question is **Cardiac Muscle**.

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