In certain kinds of muscle cells, calcium ions are stored ________.
A) in the smooth ER
B) in the rough ER
C) in both smooth and rough ER
D) in the cytoplasm
Answer: A
In certain kinds of muscle cells, calcium ions are stored ________.
A) in the smooth ER
B) in the rough ER
C) in both smooth and rough ER
D) in the cytoplasm