Once a month or so, a woman’s ____ releases an egg cell. This process, known as ____, usually occurs about 14 days after the start of the woman’s last menstrual period. The egg cell is swept through the ____, which runs from the ovary to the uterus. The egg cell is fertilized by a man’s ____ cell in the fallopian tube. During sex, the penis releases a thick, whitish fluid called ____ into the woman’s vagina. From there, the sperm cells enter the uterus and then the fallopian tubes. The sperm cells surround the egg cell if it is present. When a sperm enters an egg cell, they unite and their chromosomes mingle together. This is called fertilization. If the egg is ____ by the sperm cell, the fertilized egg cell begins to divide into two cells, then ____, then eight, and so on, while it travels the rest of the way through the fallopian tube to the uterus. There it ____ and grows into the baby. If the egg is not fertilized by the sperm, it will eventually be ____, along with the lining of the uterus, during the woman’s next menstrual ____.

The Reproductive Process

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