What Is the Stoichiometry of the NCKX Transport System

question 47

Multiple Choice

What is the stoichiometry of the NCKX transport system?

• A) One calcium and one potassium ion outward for every four sodium ions entering the cell (4 Na⁺:1 Ca²⁺:1K⁺)
• B) Three potassium ions outward for every three sodium ions and one calcium entering the cell (3 Na⁺:1 Ca²⁺:3K⁺)
• C) Two calcium ions outward for every two protons and one potassium entering the cell (2 H⁺:2 Ca²⁺:1K⁺)
• D) One ion X outward for every one sodium, one potassium and one calcium ions entering the cell (1Na⁺:1 Ca²⁺:1K⁺:1 X)
• E) Na⁺, K⁺ and Ca²⁺ are not transported in a fixed ratio through the NCX transport system

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