抗抑郁药物作用于大脑的化学物质叫做神经递质，特别是复合胺和正肾上腺素。
A. Antidepressants work on brain chemicals called neurotransmitters, especially serotonin and norepinephrine.
结论：大豆肽具有负性肌力作用，且能拮抗异丙肾上腺素对大鼠离体工作心脏的正性肌力作用。
Conclusion: Soy peptides have negative inotropic effect and can attenuate the positive inotropic effect of isoprenaline in isolated working rat hearts.
阻断肾上腺素的这种正性肌力作用，减缓心率。
Beta blockers halt this process by blocking adrenaline receptors and slowing the heart rate.
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