"Doctor Who's" Time Lords have two hearts. For Scientific American, Amelia Marvit, a biology graduate, researcher at the National Institutes of Health, aspiring doctor and Whovian, explains how the Doctor's unusual cardiovascular system could evolve and function. "How are the two hearts connected, and how are the heartbeats regulated? How does the Doctor survive centuries without developing age-related heart disease? How could a dual cardiac system have evolved? I had to find out."
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@CultureDesk author needs to read https://tardis.wiki/wiki/The_Gallifrey_Chronicles_(reference_book) rather than speculating. https://tardis.wiki/wiki/Virus_(The_Scrolls_of_Rassilon) is fairly canonical.
@falken Oh wow! A virus and nanomachines doing surgery — that does sound very "Who!"