During the estrus cycle of a cow the uterine pH decreases to approximately 6.7 (

Question

During the estrus cycle of a cow the uterine pH decreases to approximately 6.7 (which aids in sperm   transport). The Na+/H+ pump located on the epithelial cells is considered an example of active transport. Which of the following most accurately describes the movement of these ions? a) both Na+ and H+ move into the uterine epithelial cell   b) both Na+ and H+ move out of the cell   c) Na+ moves out of the cell while H+ moves into the cell   d) Na+ moves into the cell while H+ moves out of the cell   e) there is too little information to determine the direction of flow.

Explanation / Answer

d) Na+ moves into the cell while H+ moves out of the cell   

To maintain acidic environment in the uterus H+ ions are extruded in exchange for extracellular Na+, a process mediated by the Na+/H+ exchanger

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