AIM To observe the effects of 5-hydroxytryptam ine (5-HT) on intracellular free Ca 2+ of neonatal rat myocardium and to i nvestigate its mechanism.

• 目的 观察 5 -羟色胺 (5 - HT)对新生大鼠心肌细胞内游离 Ca2 + 浓度的影响 ；并探讨其作用机制 .