How does a doctor define death?

A doctor defines death as the irreversible cessation of all biological functions. This means that the heart has stopped beating, the lungs have stopped breathing, and the brain has stopped functioning. When all of these functions have ceased, the person is considered to be legally and medically dead.

There are a few different ways to determine if a person has died. One way is to check for a pulse. If there is no pulse, it means that the heart has stopped beating. Another way is to listen for breathing. If there is no breathing, it means that the lungs have stopped working. Finally, a doctor can check for brain activity using an electroencephalogram (EEG). If there is no brain activity, it means that the brain has stopped functioning.

When all of these functions have ceased, the doctor will declare the person to be dead. The doctor will then sign a death certificate, which is a legal document that states the time, date, and cause of death.