MDCAT Biology MCQ #2474

In a 'fight or flight' situation, the adrenal medulla releases adrenaline into the bloodstream. How is this secretion primarily triggered?

MDCAT Biology MCQ #2474

  1. Question 1

    Q1. In a 'fight or flight' situation, the adrenal medulla releases adrenaline into the bloodstream. How is this secretion primarily triggered?

    • A) ACTH stimulation
    • B) TSH stimulation
    • C) Sympathetic nerve fibers
    • D) Parasympathetic nerve fibers

    Answer: Sympathetic nerve fibers

    Explanation: The adrenal medulla is directly innervated by sympathetic fibers; ACTH is tempting because it only regulates the secretion of the adrenal cortex.