in the anaesthetized and paralyzed cat the cardiovascular pattern characteristic of the defence reaction , i.e . skeletal muscle vasodilatation , tachycardia and increased arterial pressure , was elicited by microinjections ( 0.40 microliter ) of the excitatory amino acid , dl-homocysteic acid ( dlh ) , into the midbrain periaqueductal grey ( pag ) matter .
C0007226
cardiovascular
C0039231
tachycardia