Common features of striated and faintly striated cardiac muscles are
(a) presence of troponin.
(b) Use of `Ca^(2+)` muscle contraction.
(c) Vasclarity Gap junctions. Control by visceral Nervous system (ANS).
Which of these features are correct?

Options

A. (b), (c) , (d) & (e)
B. (a), (b) & (e)
C. (a), (b) & (c)
D. (a), (b) , (c) & (d)

Answer

To solve the question regarding the common features of striated and faintly striated cardiac muscles, we will analyze each statement provided in the options.

### Step-by-Step Solution:

1. **Presence of Troponin**:
- Troponin is a protein complex that plays a crucial role in muscle contraction. It is found in both striated skeletal muscles and cardiac muscles. Therefore, the presence of troponin in cardiac muscles is a correct statement.
- **Conclusion**: This feature is correct.

2. **Use of Ca²⁺ in Muscle Contraction**:
- Calcium ions (Ca²⁺) are essential for muscle contraction. In cardiac muscles, the influx of Ca²⁺ triggers the contraction process. This is true for both striated skeletal muscles and cardiac muscles, as they both rely on calcium for contraction.
- **Conclusion**: This feature is correct.

3. **Vascularity and Gap Junctions**:
- Cardiac muscles are highly vascularized to supply the necessary oxygen and nutrients. Additionally, gap junctions are present in cardiac muscle cells, allowing for electrical signals to pass quickly between cells, facilitating synchronized contractions.
- **Conclusion**: This feature is correct.

4. **Control by Visceral Nervous System (ANS)**:
- Cardiac muscles are indeed influenced by the autonomic nervous system (ANS), but they are primarily controlled by intrinsic pacemaker cells in the heart. While the ANS modulates heart rate and force of contraction, it does not control the cardiac muscle in the same way it controls skeletal muscle.
- **Conclusion**: This feature is incorrect.

### Final Answer:
The correct features of striated and faintly striated cardiac muscles are:
- (a) Presence of troponin: Correct
- (b) Use of Ca²⁺ in muscle contraction: Correct
- (c) Vascularity and gap junctions: Correct
- (d) Control by visceral nervous system (ANS): Incorrect

Thus, the correct options are A, B, and C.