hormone of the hypothalamus, which consists of pentapeptydnoho cycle and side chain residues of three amino acids that accumulate in the posterior pituitary. It increases the permeability of sodium myofibrils uterus, stimulating its contraction. Threshold oxytocin induced contractions of the uterus decreases during pregnancy, high estrogen or if the animal has already begun delivery.Oxytocin is decomposed in the gastrointestinal tract, so it should be administered parenterally. After intramuscular administration of the drug effect observed after 3-5 minutes.
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