8 當某些血管內皮受損時，下列何者可直接和血管平滑肌細胞作用，造成血管收縮？

Adenosine Acetylcholine

ANP Carbon monoxide（CO）

anser AcH

even if not sure

look at who are the vasodilators:

Atrial natriuretic peptide (ANP), atrial natriuretic factor (ANF), atrial natriuretic hormone (ANH), oratriopeptin, is a powerful vasodilator,

CO: cause low O2 sat , should also cause vasodiation

adenosine:

Extracellular adenosine concentrations from normal cells are approximately 300 nM; however, in response to cellular damage (e.g. in inflammatory or ischemic tissue), these concentrations are quickly elevated (600–1,200 nM). Thus, in regard to stress or injury, the function of adenosine is primarily that of cytoprotection preventing tissue damage during instances of hypoxia, ischemia, and seizure activity. Activation of A2A receptors produces a constellation of responses that in general can be classified as anti-inflammatory.

more of the inflammatory type of reaction: that too should also cause vasodilation!!!!