Therefore, we see that the sympathetic nervous system increases heart rate, which increases cardiac output.

因此，我们看到交感神经系统会增加心率，从而增加心输出量。

T3 increases cardiac output, stimulates bone reabsorption thinning out the bones and then activates the sympathetic nervous system, the part of the nervous system responsible for our fight-or-flight response.

T3还会引起心输出量增高，刺激骨骼再吸收，引起骨骼变薄并激活交感神经系统；交感神经系统主管着“战或逃”反应。