A 9-year-old child has suffered severe lacerations and blood loss in an automobile accident. What is the most likely cause of increased vasopressin secretion in this child? A) Secretion is stimulated when the plasma volume decreases. B) Vasopressin decreases fluid loss by inhibiting aquaporin-2 (AQP2) water channel activity. C) Secretion increases as plasma osmolality decreases. D) Decreased K⁺ transport by increasing protein kinase A (PKA) activity in kidney cells. E) Secretion is increased when blood pressure increases.

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Quizplus · Accepted Answer

Vasopressin secretion is stimulated when plasma volume decreases, which would occur due to severe lacerations and blood loss, leading to a compensatory mechanism to conserve water and maintain blood pressure.

A 9-Year-Old Child Has Suffered Severe Lacerations and Blood Loss