Fill up the blanks.
A functional mammary gland is characteristic of all female __(A)__. The mammary glands are paired structures (breasts) that contain glandular tissue and variable amount of fat. The glandular tissue of each breast is divided into 15-20 mammary lobes containing clusters of cells called __(B)__. The cells of __(C)__ secrete milk, which is stored in the cavities (lumens) of alveoli. The alveoli open into mammary tubules. The tubules of each lobe join to form a __(D)__ duct. Several __(E)__ ducts join to form a wider mammary ampulla which is connected to __(F)__ duct through which milk is sucked out.
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