Question Detail
Question
Regulation of calcium in muscle cells is a function of the: a. rER b. sER c. microfilaments d. microtubules
Correct Answer
Option B is the correct answer.
Detailed Explanation
In muscle cells, a specialized form of smooth endoplasmic reticulum called the sarcoplasmic reticulum (SR) plays a crucial role in regulating calcium ion (Ca2+) concentration. It releases calcium to trigger muscle contraction and sequesters it to cause relaxation.
Hint
The 'smooth' ER in muscles has a special name and is a calcium reservoir.