Exam 3: The Tissue Level of Organization

Which of the following is not a germ layer?

Endoderm forms many glands, such as those associated with the gastrointestinal tract.

The embryonic notochord will eventually be replaced by the developing , leaving only remnants that persist as the nucleus pulposus of intervertebral discs.

Figure 3.1 Use the diagram above to answer the following questions. -Which letter indicates the oocyte?

The expression ʺbreaking waterʺ during birthing refers to the

Sex can be determined from the genitals.

The sclerotome will develop into the

The most common cause of mental retardation in the United States is

Fertilization is to zygote as

Approximately percent of all children have some birth defect.

This develops into the brain and spinal cord.

The embryonic layer that invades the lining of the uterus and forms the placenta is the

Spina bifida results when the neural tube fails to close in the head.

Which of the following adult structures derives from neural crest?

Production of surfactant begins during week 22-26 of the gestational period. Premature infants born after week 26

The primary germ layer that ultimately produces the hair, fingernails, and toenails is

Limb buds emerge in the human embryo about

Which characteristic is not true of a blastocyst?

The ability of one cell to influence the development of its neighboring cells is called

The intermediate mesoderm forms the .