What Explains the Increased Concentration of Ca⁺⁺ in the ER

question 31

Multiple Choice

What explains the increased concentration of Ca⁺⁺ in the ER?

• A) Calcium ions are actively imported from the cytoplasm into the ER.
• B) Calcium concentration is kept low in the cytoplasm because of its high usage level.
• C) Calcium cannot enter the plasma membrane through ion channels.
• D) Calcium levels in the blood or other body fluids are extremely low.
• E) The Ca ions are recycled from other molecules in the ER.

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