the majority were concentrated in and around the two nuclei involved in the cardiovascular control system , i.e . the nucleus para-ambiguus ( 55.5 % ) which is known as a pressor-tachycardia-apnea response zone and nucleus retrofacialis ( 10.3 % ) which is known as a depressor-bradycardia-apnea response zone .
C0007226
cardiovascular
C0428977
bradycardia