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U

Unconditioned reflex

a reflex that is automatic and unconscious


Unicellular

composed of a single cell


Uniparous

gives birth to one neonate


Upper motor neuron

a motor neuron that starts in the brain and transfers information to the spinal cord


Uraemia

increased level of urea in the blood


Urethritis


Urinary incontinence

inability to control the flow of urine out of the body


Urinary tenesmus

straining to pass urine


Urolith

a calculus in the urinary tract


Urolithiasis

the formation of uroliths, calculi or 'stones' in the kidney, bladder or urethra