The sight of the calf or the sound of the Single Bucket Milking Machine or by massaging the udder stimulates the nerves. From the nerves, signals/impulses pass to the hypothalamus in the brain. The hypothalamus stimulates the posterior pituitary gland to discharge oxytocin. Blood carries this hormone to the myoepithelial cells that surround the alveoli. The contraction of the myoepithelial cells forces the milk into the duct system and the gland cistern. Alevoli is a Tiny Ball connected to the milk duct. There are millions of alevoli in the udder.

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