It is possible for a person to have respiration and a heart beat even when there is no cortical functioning of the brain.

Name: It is possible for a person to have respiration and a heart beat even when there is no cortical functioning of the brain.
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This phenomenon is known as "brainstem death" where the brainstem, responsible for regulating vital functions such as breathing and heart rate, is still functioning while the cortex, responsible for conscious thought and perception, is not.

It Is Possible for a Person to Have Respiration and a Heart