S1Y4M3P3A1T1H4I1N1
19 points
SYMPATHIN is validvalid
a substance secreted by sympathetic nerve-endings, which constricts and dilates blood-vessels
a substance secreted by sympathetic nerve-endings, which constricts and dilates blood-vessels
a substance secreted by sympathetic nerve-endings, which constricts and dilates blood-vessels
a substance secreted by sympathetic nerve-endings, which constricts and dilates blood-vessels