Section 3


• Sequence the events of fertilization, cleavage, and implantation.

• Describe the three stages of pregnancy.

• Summarize the development of an embryo during pregnancy.

• Discuss the effects of unnecessary drug use on development.

• Describe the changes in a mother's body during birth.

vocabulary gestation blastocyst implantation pregnancy trimester embryo amniotic sac chorionic villus placenta umbilical cord human chorionic gonadotropin fetus labor afterbirth figure 51-9

Several sperm surround this ovum, but only one will be able to fertilize it. (SEM 1165 x)

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