An Epithelial Cell Layer Bathed in Physiological Saline Solution on Both

question 38

Multiple Choice

An epithelial cell layer bathed in physiological saline solution on both apical and basolateral surfaces starts out in a steady state in which there is constant absorption of Na⁺, Cl^-, and H₂O. The addition of ouabain to the basolateral side will cause:

• A) Intracellular Na⁺ to rise and intracellular K⁺ to remain constant
• B) Intracellular Na⁺ to fall and intracellular K⁺ to rise
• C) Intracellular Na⁺ to rise and intracellular K⁺ to fall
• D) Intracellular Na⁺ to remain constant and intracellular K⁺ to fall
• E) Intracellular Na⁺ to remain constant and intracellular K⁺ to remain constant