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Common features of striated and faintly ...

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

A

(b), (c) , (d) & (e)

B

(a), (b) & (e)

C

(a), (b) & (c)

D

(a), (b) , (c) & (d)

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding the common features of striated and faintly striated cardiac muscles, we will analyze each option provided in the question. ### Step-by-Step Solution: 1. **Understanding Cardiac Muscles**: - Cardiac muscles are specialized muscles found in the heart. They are striated, involuntary, branched, and typically have a single nucleus. 2. **Option (a): Presence of Troponin**: - Troponin is a protein that plays a crucial role in muscle contraction. It is present in both striated (skeletal) and cardiac muscles. Therefore, this statement is **correct**. 3. **Option (b): Use of Ca²⁺ in Muscle Contraction**: - Calcium ions (Ca²⁺) are essential for muscle contraction in all types of muscle, including cardiac muscles. They facilitate the interaction between actin and myosin, leading to contraction. Thus, this statement is also **correct**. 4. **Option (c): Vascularity and Gap Junctions**: - Cardiac muscles have a rich blood supply (vascularity) and contain gap junctions. These gap junctions allow for the rapid transmission of electrical impulses between cardiac muscle cells, facilitating synchronized contractions. Therefore, this statement is **correct**. 5. **Option (d): 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 (like the sinoatrial node) and not directly by the ANS. The ANS modulates heart rate but does not control the contraction directly. Therefore, this statement is **incorrect**. ### Conclusion: Based on the analysis: - Correct features are: **(a) Presence of troponin, (b) Use of Ca²⁺ in muscle contraction, and (c) Vascularity and gap junctions**. - The incorrect feature is: **(d) Control by visceral nervous system (ANS)**. Thus, the correct answer is **(a), (b), and (c)**.
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