Biology · Human Physiology
A long-distance athlete collapses after running in extreme heat. He drank large amounts of plain water during the run but consumed no electrolytes. On examination, his blood Na+ concentration is significantly low, plasma osmolarity is reduced, blood pressure is slightly decreased, and urine output is high and dilute. Doctors suspect a condition resembling water intoxication (dilutional hyponatremia). Which hormonal response explains the patient's symptoms?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1ANF release to increase blood volume
- 2Increased aldosterone secretion to excrete excess Na+
- 3Increased ADH release causing more water retention
- 4Suppressed ADH release leading to increased water excretion✓
Correct answer
Suppressed ADH release leading to increased water excretion
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