Part two Objective To compare the cardiovascular toxicity in 28-day treated SD rats and 14-day treated SHR and to explore the underlying mechanisms induced by dimethoate.

• 第二部分 目的：探讨乐果染毒28天的雄性SD大鼠和乐果染毒14天的雄性自发高血压大鼠（SHR）心血管毒性差异，以及乐果诱导心血管毒性的可能机制。