Describe both urophysis and corpuscles of Stannius in fishes in detail.
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Urophysis and corpuscles of Stannius are two important structures found in the endocrine system of fishes.
Urophysis is a neurosecretory organ located in the caudal part of the brain of fishes. It is responsible for producing and releasing the hormone urotensin I, which plays a role in regulating osmoregulation and cardiovascular function in fishes. Urotensin I is a potent vasoconstrictor that helps regulate blood pressure and blood flow in fishes. Urophysis is also involved in the regulation of body fluid balance and electrolyte levels in fishes.
Corpuscles of Stannius are small, glandular structures located near the kidneys of fishes. They are responsible for producing and releasing the hormone stanniocalcin, which plays a role in regulating calcium and phosphate levels in the blood of fishes. Stanniocalcin helps maintain proper mineral balance in the body and is important for bone formation and growth in fishes. It also plays a role in regulating ion transport in the gills and kidneys of fishes.
Overall, urophysis and corpuscles of Stannius are important endocrine structures in fishes that play a crucial role in maintaining proper physiological balance and function in these aquatic animals.