While visiting a foreign country, Milly inadvertently drinks some water, even though she had been advised not to. She contracts an intestinal disease that causes severe diarrhea. How would you expect her condition to affect her blood pH, urine pH, and pattern of ventilation?

검증된 단계별 안내

Step 1: Understand the physiological impact of severe diarrhea on the body's acid-base balance. Diarrhea causes excessive loss of bicarbonate (HCO\_3\^-), which is a base, from the intestines. This loss leads to a decrease in blood bicarbonate levels, resulting in metabolic acidosis (a decrease in blood pH).

Step 2: Predict the effect on blood pH. Since bicarbonate acts as a buffer to neutralize acids in the blood, losing bicarbonate through diarrhea reduces the blood's buffering capacity, causing the blood pH to drop (become more acidic).

Step 3: Consider the kidney's response and urine pH. To compensate for metabolic acidosis, the kidneys will try to excrete more hydrogen ions (H\^+) and conserve bicarbonate, which typically results in more acidic urine (lower urine pH).

Step 4: Analyze the respiratory system's compensatory response. The body will attempt to correct the acidosis by increasing ventilation (hyperventilation) to blow off more carbon dioxide (CO\_2), which reduces carbonic acid in the blood and helps raise blood pH toward normal.

Step 5: Summarize the expected changes: blood pH decreases (acidosis), urine pH decreases (more acidic), and ventilation rate increases (hyperventilation) as a compensatory mechanism.

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Effect of Diarrhea on Acid-Base Balance

Severe diarrhea causes loss of bicarbonate-rich intestinal fluids, leading to a decrease in blood bicarbonate levels. This results in metabolic acidosis, characterized by a lowered blood pH due to the reduced buffering capacity in the blood.

Renal Compensation and Urine pH Changes

In response to metabolic acidosis, the kidneys attempt to compensate by excreting more hydrogen ions and reabsorbing bicarbonate. This leads to a decrease in urine pH, making the urine more acidic as the body tries to restore acid-base balance.

Respiratory Compensation via Ventilation

To compensate for metabolic acidosis, the respiratory system increases ventilation rate (hyperventilation) to expel more CO2. Lowering CO2 reduces carbonic acid in the blood, helping to raise blood pH toward normal.