Chapter 3 review

The three stages of birth are not of equal length; the first stage is ______ than the others. shorter sometimes shorter, sometimes longer longer

Longest out of the three

Approximately one week after conception, when differentiation of the cells begins, the zygote is now a group of cells called the ______. blastocyst trophoblast embryo fetus

blastocyst

The ______ period of prenatal development takes place in the first two weeks after conception. embryonic fetal germinal trophoblastic

germinal

The period includes the creation of the fertilized egg or zygote, cell division and implantation.

germinal

Prenatal care often includes which of the following components? Social services Financial incentives Nutritional services Comprehensive educational services

social, nutritional and educational services

Any agent that can potentially cause a birth defect or negatively alter cognitive, behavioral or physical outcomes is a(n)

teratogen

Any agent that can potentially cause cognitive, behavioral or physical harm to the developing embryo or fetus is a(n) ______. psychoactive drug disease teratogen trophoblast

teratogen

The outer layer of cells around the embryo (which will eventually provide nutrition and support for the embryo) is called the .

thropoblast

The outer layer of cells that eventually provide nutrition and support for the embryo is called the ______. endoderm blastocyst dermocyst trophoblast

trophoblast