After the birth of her first child, a 25-year-old woman breast-fed the infant for about 1 year. Which of the following processes that occurred in the breast during pregnancy allowed her to breast-feed the infant? A: Stromal hypertrophy B: Lobular hyperplasia C: Intracellular accumulation of fat D: Ductal epithelial metaplasia

After the birth of her first child, a 19-year-old woman breast-fed the infant for about 1 year. Which of the following processes that occurred in the breast during pregnancy allowed her to breast-feed the infant? A: Stromal hypertrophy B: Lobular hyperplasia C: Epithelial dysplasia D: Intracellular accumulation of fat E: Ductal epithelial metaplasia

A 30-year-old man sustains a left femoral fracture in a skiing accident, and his leg is placed in a plaster cast. After the leg has been immobilized for several weeks, the diameter of the left calf has decreased. This change is most likely to result from which of the following alteration in the calf muscles? A: Metaplasia B: Hyperplasia C: Necrosis D: Atrophy