A) Oxytocin - posterior pituitary, growth and maintenance of mammary glands.
B) Melatonin - pineal gland, regulates the, normal rhythm of sleepwake cycle.
C) Progesterone - corpus-luteum, stimulation of growth and activities of female secondary sex organs.
D) atrial natriuretic factor - ventricular wall increases the blood pressure.
Correct Answer: B
Solution :
Hormones are non-nutrient chemicals which act as intercellular messengers and are produced in trace amounts. Gastrointestinal tracts secretes four major peptide hormones - gastrin, secretin, cholecystokinin (CCK) and gastric inhibitory peptide (GIP) while juxtaglomerular cells o kidney secretes erythropoietin, a peptide hormone.
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