thus for example under , the influence of epinephrine , norepinephrine , prostaglandine f2 alpha and oxytocine , the tonicity of the vascular system increases and does so the number of spontaneous contractions rather noticeably , particularly under the influence of prostaglandine f2alpha , and under the various catecholamines an increase of frequency and amplitude has been observed .
C0014563
epinephrine
C0028351
norepinephrine