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P

Parenteral nutrition

nutrition that is given intravenously

Parturition

the process of giving birth

Passive transport

movement of molecules down a concentration gradient without energy use

Pathogen

a disease-producing organism

Pathogenesis

 the origin and development of disease

Pathogenic

capable of causing disease

Penetrating power

the ability of X-rays to penetrate tissue i.e. their energy affected by kV setting

Penumbra

zone of unsharpness or blurring on a radiograph

 

Peripheral nervous system

part of the nervous system outside the brain and spinal cord

Peristalsis

waves of muscular contractions that occur in tubular structures to move contents forwards, e.g. food and other ingested material is moved along the gastrointestinal tract towards the anus. Peristalsis also occurs in the uterine tubes and the ureters.

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