Functionally cardiac muscles are similar to `:-`

Options

A. Unstriped muscles
B. Striped muscles
C. Striped & Unstriped muscles
D. None

Answer

### Step-by-Step Solution:

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

2. **Identifying Cardiac Muscle Characteristics**:
- Cardiac muscles are striated (striped) like skeletal muscles but are different in function. They are responsible for pumping blood and are involuntary.

3. **Defining Functional Similarity**:
- The question asks for functional similarity, which means we need to focus on how the muscles operate rather than their physical appearance.

4. **Comparing Cardiac and Smooth Muscles**:
- Smooth muscles, also known as unstriped muscles, are involuntary like cardiac muscles. They contract and relax continuously without conscious control.

5. **Conclusion**:
- Therefore, functionally, cardiac muscles are similar to smooth (unstriped) muscles because both are involuntary and continuously contract and relax.

### Final Answer:
Functionally, cardiac muscles are similar to smooth muscles (unstriped muscles).

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