Physiology

Physiology is a branch of biology involved in the scientific study of functions and mechanisms in a living system.

The War Doctor knew physiology, and was able to tell how people died by checking corpses. (COMIC: The Organ Grinder)

The Tenth Doctor observed that the Krillitanes changed their physiology so often that their own oil became toxic to them. (TV: School Reunion)

Davros had such knowledge of biology including physiology. (AUDIO: Innocence, Purity, Corruption, Guilt, Davros) It would play a part in him converting Kaled mutants into the first Daleks, (TV: Genesis of the Daleks) to convert humans into some of them (TV: Revelation of the Daleksl AUDIO: Terror Firma) and some into Juggernauts, (AUDIO: The Juggernauts) and also to build the New Dalek Empire from his own cells. (TV: The Stolen Earth|Journey's End)