The brain stem, at the organ's base, controls reflexes and crucial, basic life functions such as heart rate, breathing, and blood pressure.

脑干位于器官的底部，它控制反射和重要的、基础的生命功能，比如心率、呼吸和血压。

youdao

The brain stem is also the centre from which primitive reflexes are mediated.

此外，脑干还是原始反射的控制与调解中心。

youdao

He said he could elicit no brain stem reflexes and he concluded in his own mind that she was brain stem dead.

BBC: Barry McCarney