The mammary glands enlarge during pregnancy primarily as a consequence of:

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The mammary glands enlarge during pregnancy primarily as a consequence of hormonal hyperplasia, which is an increase in the number of cells due to hormonal stimulation. During pregnancy, estrogen and progesterone levels increase, which causes the mammary glands to undergo development and enlargement in preparation for lactation. The increase in hormone levels also causes the alveolar cells in the mammary glands to proliferate and differentiate into milk-secreting cells.

The Mammary Glands Enlarge During Pregnancy Primarily as a Consequence