the cardiovascular effects of 5-hydroxytryptamine ( 5-ht ) , consisting of bradycardia or tachycardia , hypotension or hypertension , and vasodilatation or vasoconstriction , are mediated by three main types of receptors called 5-ht1-like , 5-ht2 , and 5-ht3 .
C0007226
cardiovascular
C0039231
tachycardia