Final answer:
Smooth muscle can undergo both hypertrophy and hyperplasia. During puberty, increased estrogen levels can cause hyperplasia in the uterus, leading to the growth of the myometrium.
Step-by-step explanation:
Smooth muscle can undergo both hypertrophy and hyperplasia. Hypertrophy refers to an increase in the size of a structure, and smooth muscle can increase in size through exercise or other growth stimuli. Hyperplasia, on the other hand, involves an increase in the number of cells. Smooth muscle cells can divide to produce more cells, leading to an increase in the overall number of muscle fibers in organs such as the uterus. Estrogen levels during puberty, for example, can cause the uterus to undergo hyperplasia, resulting in the growth of the myometrium.