Glossary with audio assistance

Browse the glossary using this index

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


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


pertaining to the kidneys


a source of infection

Residual volume

the volume of air left in the lungs after the deepest possible expiration; the air that is always in the lungs


the ability to distinguish between two objects very close together; the higher the resolution of an image the greater the detail that can be seen


breathing; exchange of gases - oxygen and carbon dioxide

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