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P

Pulmonary

pertaining to the lungs

Pulse rate

the number of times a pulse is felt in one minute; this should be the same as the heart rate

Pyaemia

the presence of a pus-forming organism in the blood

Pyothorax

pus in the pleural cavity

R

Radiograph

a visible record on film of the pattern of X-rays passing through a patient

Receptors

sensory cells that receive information from the environment, in the form of a stimulus, and transfer this information to the brain or spinal cord as a nerve impulse

Recessive gene

a gene which is only expressed in the phenotype when no dominant allele is present

Reflex action

a fast, automatic response to a stimulus

Reflex arc

the pathway taken by an action potential leading to a reflex action

Renal

pertaining to the kidneys

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