Question

In the sarcoplasmic reticulum of resting muscle, Ca${}^{2+}$ are held together by which protein?

• A. Nebulin
• B. Desmin
• C. Calsequestrin
• D. Calmodulin

Answer 1

The correct option is D Calmodulin

In the sarcoplasmic reticulum of resting muscle, Ca2+ are held together by calmodulin. Calmodulin is also called as calcium-modulated protein, is a calcium-binding protein present in the cytoplasm. It is present in all eukaryotic cells.it's the function is to bind calcium ions in resting muscle. when the motor impulse is generated and reached to neuromuscular junctions calcium is released from calmodulin which facilitates muscle contraction.

So, the correct answer is 'Calmodulin'.