Final answer:
The nipple is a part of the female breast and is surrounded by a pigmented area called the areola. It plays a crucial role in lactation, as milk passes through the lactiferous ducts and is released from the nipple in response to a baby's suckling. The areola also contains glands that secrete a protective fluid.
Step-by-step explanation:
The nipple is a part of the female breast and is located at the center of the areola, which is a pigmented area surrounding the nipple. During lactation, milk moves from the alveoli through the lactiferous ducts to the nipple, where it exits the breast in response to the suckling action of an infant. The areola contains glands that secrete an oily fluid to lubricate and protect the nipple during breastfeeding.