How is milk produced in mammals

In the uniquely mammalian process of lactation,a special class of milk-secreting cells known as mammocytes line up in a single layer around pear-shaped alveoli.Those cells absorb all of the building blocks of milk,then synthesize tiny droplets of fat on structures called smooth endoplasmic reticula.The droplets combine with each other and other molecules and are then expelled and stored in spaces between cells.Mammary glands eventually secrete the milk through the breasts, udders,or, in the rare case of the platypus, through ducts in the abdomen.