Which of the Following Is the Most Plausible Explanation for Why

question 34

Multiple Choice

Which of the following is the most plausible explanation for why an animal cell would be unable to reduce the Ca²⁺ concentration in its cytosol compared with the extracellular fluid?

• A) inactivation of calcium-gated ion channels in the cell membrane
• B) excessive transport of calcium from the cytosol into the endoplasmic reticulum
• C) insufficient ATP levels in the cytosol
• D) insufficient levels of protein kinase in the cell

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