Question 1

Bree's arterial blood at basecamp showed PO2 = 63 mmHg, PCO2 = 29 mmHg, and pH = 7.23. Which of the following best describes her acid-base status?

Accepted Answer

Metabolic acidosis with respiratory compensation

Question 2

During the climb, Bree experienced increased breathing frequency and heart rate. Which physiological mechanism is most likely responsible for her hyperventilation at high altitude?

Accepted Answer

Stimulation of peripheral chemoreceptors by decreased arterial PO2

Question 3

Bree was given hyperosmotic fluids with low $$[K^+]$$, high $$[Na^+]$$, and high $$[glucose]. $$Which of the following is a likely consequence of this treatment?

Accepted Answer

Increased risk of hypernatremia and osmotic diuresis

Question 4

Assuming Bree's plasma glucose concentration increased to 300 mg/100 ml, and her renal transport maximum ($$T_m) $$for glucose is 375 mg/min, with a normal glomerular filtration rate (GFR) of 125 ml/min, which of the following is correct?

Accepted Answer

Glucose will appear in urine because filtered load exceeds $$T_m$$

Question 5

Bree's symptoms at high altitude included heavy coughing and difficulty breathing. Which of the following best explains the decrease in her arterial PO2?

Accepted Answer

Reduced atmospheric pressure leads to decreased alveolar PO2

Question 6

After receiving fluids, Bree felt the urge to urinate frequently but had trouble standing. Which of the following is most likely responsible for her increased urine output?

Accepted Answer

Osmotic diuresis due to high plasma glucose

Question 7

Bree's arterial pH was 7.23. Which equation can be used to calculate her plasma bicarbonate concentration, given her arterial PCO2 and pH?

Accepted Answer

Henderson-Hasselbalch equation: $$pH = 6.1 + \log\left(\frac{[$$HCO_3$$^-]}{0.03 	imes $$PCO_2$$}ight)$$

Question 8

Which of the following would you expect to increase Bree’s oxygen delivery to tissues during her climb, assuming no underlying disease?

Accepted Answer

Increased hemoglobin concentration

Question 9

After Bree’s meal at the restaurant, which hormonal response would you expect to be most prominent?

Accepted Answer

Increased insulin secretion

Question 10

Bree’s high-altitude exposure led to increased ventilation. Which equation best describes the relationship between alveolar ventilation and arterial CO2?

Accepted Answer

Alveolar ventilation equation: $$P_{$$aCO_2$$} = \frac{V_{CO_2$} 	imes K}{V_A}$$

Question 11

Which of the following is most likely to occur in Bree’s kidneys after administration of hyperosmotic fluids with high $$[Na^+]$$?

Accepted Answer

Decreased renin secretion due to increased blood volume

Question 12

Bree’s urge to urinate after fluid administration is best explained by which renal mechanism?

Accepted Answer

Osmotic diuresis from excess glucose in filtrate

Question 13

Which of the following would be expected in Bree’s blood after her high-calorie meal, prior to her brisk walk?

Accepted Answer

Elevated blood glucose and triglycerides

Question 14

During Bree’s brisk walk after her meal, which metabolic process is most likely to increase?

Accepted Answer

Glycogenolysis in skeletal muscle

Question 15

Which of the following is a likely outcome of Bree’s rapid consumption of a high-calorie meal?

Accepted Answer

Increased secretion of cholecystokinin and insulin

Question 16

If Bree’s mean arterial pressure increased from 80 mmHg to 120 mmHg after fluid administration, which renal regulatory mechanism would be activated?

Accepted Answer

Decreased renin secretion and increased natriuresis

Question 17

Which of the following best explains Bree’s loss of consciousness at basecamp?

Accepted Answer

Severe hypoxemia leading to decreased cerebral oxygen delivery

Question 18

Which of the following would be expected in Bree’s urine after administration of hyperosmotic fluids with high $$[glucose]$$?

Accepted Answer

Presence of glucose due to exceeding renal transport maximum

Question 19

Which of the following is most likely to occur in Bree’s body as a rapid response to her high-calorie meal?

Accepted Answer

Increased insulin secretion and glucose uptake by tissues

Question 20

Which equation best describes the filtered load of glucose in Bree’s kidneys?

Accepted Answer

Filtered load = $$[Glucose]_{plasma} 	imes GFR$$

Step-by-Step Guidance for ANP Case Study: Bree's High-Altitude and Physiological Responses

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