Which of the following is false about the sarcoplasmic reticulum?
Correct answer: D. The sarcoplasmic reticulum is found ONLY in voluntary muscle cells.
- A. The sarcoplasmic reticulum is a specialized smooth endoplasmic reticulum
- B. The sarcoplasmic reticulum releases calcium ions into the cytoplasm of the muscle cells
- C. A change in membrane potential causes the sarcoplasmic reticulum to become permeable to calcium ions
- D. The sarcoplasmic reticulum is found ONLY in voluntary muscle cells.
Explanation
The correct answer is Option D. The statement that the sarcoplasmic reticulum is found ONLY in voluntary muscle cells is false. While it is highly developed in skeletal (voluntary) muscle cells, it also exists in involuntary muscles, such as cardiac and smooth muscles, where it performs similar functions related to calcium ion management crucial for muscle contraction. Option A is correct because the sarcoplasmic reticulum is indeed a specialized form of the smooth endoplasmic reticulum. Option B is true, highlighting the essential role of calcium release in muscle contraction. Option C is correct, emphasizing the importance of membrane potential changes in controlling calcium ion release from the sarcoplasmic reticulum.
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