Final answer:
The sympathoadrenal system triggers simultaneous mass activation of the adrenal medulla and the sympathetic system.
Step-by-step explanation:
The statement is True.
The sympathoadrenal system involves the simultaneous activation of the adrenal medulla and the sympathetic nervous system. When the sympathetic nervous system is activated, it triggers the release of hormones, including adrenaline, from the adrenal medulla. These hormones help prepare the body for a fight-or-flight response in response to stress or high-arousal situations.