Question

people who engage in extreme sports often do them to feel the rush of epinephrine and norepinephrine. the rush comes from the:
neural networks.
adrenal glands.
somatic and parasympathetic nervous systems.
reflex pathways.

Explanation:

Epinephrine (adrenaline) and norepinephrine (noradrenaline) are hormones primarily secreted by the adrenal glands (specifically the adrenal medulla) in response to stress or excitement, which creates the "rush" felt during extreme sports. Neural networks are broad pathways, the somatic/parasympathetic systems do not secrete these hormones for this rush, and reflex pathways are for rapid motor responses, not this hormonal rush.

Answer:

adrenal glands.