Biology Cell NUMS 2023
PMDC Verified Question 44 of 143
Sarcoplasmic reticulum for muscle fibers is mainly responsible for:
A
Calcium storage
B
Storing cell wastes
C
Protein synthesis
D
Lipid metabolism
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Calcium storage
Concept: Muscle contraction is tightly regulated by intracellular ion concentrations.

Solution: In muscle cells, the smooth endoplasmic reticulum is highly specialized and renamed the sarcoplasmic reticulum. Its primary role is the active sequestration and calcium storage (\(\text{Ca}^{2+}\)). Upon nervous stimulation, it releases calcium to trigger muscle contraction.

Distractor Autopsy: While standard SER handles lipid metabolism, the sarcoplasmic reticulum is evolutionarily adapted specifically for calcium handling.

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