Exactly! How could the heart and lungs still be operating without the brain.
From the FAQ in #35
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Q: But her heart is still beating! Her body is warm! And her kidneys are making urine! Are you telling me that dead people have beating hearts? Should we make caskets waterproof to protect the ground from all the urine the dead people make?
A: Clearly you don't understand basic human anatomy and physiology. The heart, kidneys, and lungs do not require a brain to function. If I hooked a human kidney up to an oxygenated blood flow, it would produce urine, no brain (or batteries) required. Same thing goes for the lungs, heart, and all the other cellular mechanisms. Because Jahi's body is hooked up to a ventilator, it pumps oxygenated air into her lungs. Her lungs, also requiring no brain input to exchange gases, continue to exchange oxygen for carbon dioxide, and her cells which are receiving blood flow (remember, her brain is NOT getting blood flow) will continue to function. So her body will stay warm, her heart will still beat, and her kidneys will still make urine.