A patient with chronic diarrhea presents with low blood pressure, tachycardia, and decreased urine output. Labs show low plasma bicarbonate and low blood pH. Which change would most likely restore homeostasis in the described system?
- Decreased ventilation to retain and raise blood pH
- Increased ventilation to decrease , partially compensating for metabolic acidosis (correct answer)
- Decreased renal ammonium production to conserve bicarbonate
- Increased aldosterone secretion decreasing sodium reabsorption to expand plasma volume
Explanation: This question assesses understanding of organ system integration and homeostasis mechanisms as outlined in Foundational Concept 3. Homeostasis involves dynamic processes that maintain internal stability through system interaction and feedback mechanisms. In the scenario, the respiratory and renal systems compensate for metabolic acidosis from diarrhea. Choice B is correct because it accurately reflects increased ventilation reducing PCO2 to raise pH. Choice A is incorrect as it misinterprets ventilation's compensatory direction, a common error in acid-base disorders. When evaluating homeostasis-related questions, consider the role of feedback loops and regulatory pathways in maintaining balance, such as chemoreceptor-driven responses.