Final answer:
False. A person is considered clinically dead when there is irreversible cessation of all brain activity, including that of the brainstem, and no response to any external stimuli.
Step-by-step explanation:
T or F: A person is considered clinically dead when the heart stops beating.
False. A person is considered clinically dead when there is irreversible cessation of all brain activity, including that of the brainstem, and no response to any external stimuli. This is known as brain death. While the heart stopping can lead to brain death if not treated promptly, it does not define clinical death.