As you climb up a large mountain you find yourself out of breath in response to
ID: 163593 • Letter: A
Question
As you climb up a large mountain you find yourself out of breath in response to the low oxygen content of the air. You also find that you are peeing a lot, even though your water consumption has not increased. Which of the following is probably happening inside you?
Question 32 options:
Exertion from the hike is increasing water loss due to sweat, causing Antidiuretic Hormone (ADH) to be released
The dry, low density-air at elevation reduces pressure on your bladder, increasing the need to pee
Glucocorticoids from your adrenal glands have down-regulated bladder control
Your red blood cells are becoming more concentrated
Atrial Naturiatic Factor (ANF) levels have been suppressed by epinephrine and norepinephrine
Exertion from the hike is increasing water loss due to sweat, causing Antidiuretic Hormone (ADH) to be released
The dry, low density-air at elevation reduces pressure on your bladder, increasing the need to pee
Glucocorticoids from your adrenal glands have down-regulated bladder control
Your red blood cells are becoming more concentrated
Atrial Naturiatic Factor (ANF) levels have been suppressed by epinephrine and norepinephrine
Explanation / Answer
The osmotic center, which that detects the concentration of the blood, gets reset to concentrate the blood. It causes altitude diuresis as the kidneys excrete more fluid. This effect is due to increase of hematocrit (concentration of red blood cells) to improving the blood's oxygen-carrying ability.
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