Hi. I can't understand why lungs vasoconstrict during sympathetic stimulation. Hope someone can shed some light into this matter for me.
Here's some background: My school notes say 1) Pulmonary Parasympathetic Stimulation induces Vasodilation. 2) Pulmonary Sympathetic Stimulation by Norepinephrine causes mostly vasoconstriction through alpha receptors and slight Vasodilation through beta receptors.
I tend to assume Sympathetic stimulation as fight-or-flight stimulation. If my assumption is true, then the blood vessels in the lungs should dilate during fight-or-flight (sympathetic) stimulation to increase blood flow through the lungs to supply enough oxygen to the body. Why is my thinking wrong or inconsistent with my school notes?
Here's some background: My school notes say 1) Pulmonary Parasympathetic Stimulation induces Vasodilation. 2) Pulmonary Sympathetic Stimulation by Norepinephrine causes mostly vasoconstriction through alpha receptors and slight Vasodilation through beta receptors.
I tend to assume Sympathetic stimulation as fight-or-flight stimulation. If my assumption is true, then the blood vessels in the lungs should dilate during fight-or-flight (sympathetic) stimulation to increase blood flow through the lungs to supply enough oxygen to the body. Why is my thinking wrong or inconsistent with my school notes?