Final answer:
During 'fight or flight,' arterioles in skeletal muscles dilate due to adrenergic sympathetic fibers, which allows increased blood flow to active muscles without significantly affecting overall blood pressure.
Step-by-step explanation:
In fight or flight situations, some mammals exhibit vasodilation in skeletal muscles, which is primarily facilitated by adrenergic sympathetic neurons. These specialized fibers release neurotransmitters like epinephrine and norepinephrine that circulate through the bloodstream rapidly, affecting many organ systems at once. This contrasts with cholinergic neurons, which generally are associated with the parasympathetic nervous system and not with the fight or flight response. It is notable that in skeletal muscle arterioles, vasodilation does not significantly impact overall blood pressure but rather enhances blood flow to actively engaged skeletal muscles during such stress responses.
During the "fight or flight" response in mammals, arterioles in skeletal muscles demonstrate vasodilation by adrenergic sympathetic fibers. These fibers release norepinephrine, which binds to alpha-adrenergic receptors on the smooth muscle cells of arterioles, causing them to relax and dilate. This allows for increased blood flow to the skeletal muscles, providing them with oxygen and nutrients to support physical activity.