Physiology When the sympathetic nervous system is activated: A Norepinephrine is released by the vascular smooth muscle cells B Acetylcholine is released onto vascular smooth muscle cells C Norepinephrine is released from axons onto the arteriolar wall D The arterioles constrict because nitric oxide production is suppressed 💡 Explanation When the sympathetic nervous system is activated: ✓ Correct Answer: C. Norepinephrine is released from axons onto the arteriolar wall