A) Testosterone hormone
B) Antidiuretic hormone
C) Oxytocin hormone
D) Insulin
E) All of the above
Correct Answer: B
Solution :
Antidiuretic Hormone (ADH, vasopressin) is ring-structure, octapeptide hormone produced by hypothalamic neurosecretory cells and released into posterior pituitary circulation. It has marked vasoconstrictor effects on arterioles raising blood pressure and increases water permeability of collecting ducts and distal convoluted tubules to the 10-20% of the initial glomerular nitrate, resulting in water retention. It acts via cAMP; its release is inhibited by alcohol, which, therefore, stimulates urine production, its concentration in blood depends on the rate of urine production and is zero when urine production is at its maximum rate. Oxytocin is a hormone, released by the posterior pituitary gland that pauses increased contraction of the womb during labour and stimulates the ejection of milk from the breasts. Testosterone produced largely by the Leydig cell of the testes, promotes protein synthesis, sexual behaviour and spermateliosis.
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