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Glossary

Urea Water-soluble compound that is the major
nitrogenous end product of protein metabolism
and the chief nitrogenous component of urine

Ureter Long, narrow duct that conveys urine from the
kidneys to the urinary bladder
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Ureteritis Inflammation of the ureter; characterised by
pain, swelling, redness and heat
Urinary bladder Elastic, muscular sac situated in the interior
part of the pelvic cavity in which urine collects
before excretion
Utriculus Sac-like structure in the inner ear

Vagus nerve Cranial nerve X, a mixed motor and sensory
nerve that runs between the brain and the heart,
gut and part of the respiratory tract
Vasoconstriction Constriction of the arterioles and capillaries
near the skin, which reduces blood flow and
conserves body heat
Vasodilation Dilatation of the arterioles and capillaries near
the skin which increases blood flow and helps
the body to lose excess heat
Vitreous humour Jelly-like fluid filling the posterior cavity of
the eyeball

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