The upper boundary of the thermoneutral zone; when ambient temperature rises above this limit, heat production in the organism increases.
Upper critical temperature
Definition
Related terms
Undernutrition, undernourishment
Condition caused by restricted nutrient intake; leads to weight loss, reduced pr...
Ureotelous animals
Animals that excrete mainly urea as the end product of nitrogen metabolism.
Ureter
A narrow muscular tube conveying urine from the kidneys to the middle section of...
Uricotelous animals
Animals that excrete mainly uric acid as the end product of nitrogen metabolism.
Urine
Excretion of the kidneys.
Urine in poultry
In the cloaca, the concentrated secretion of the kidneys; a component of the dro...
