Exam 3: The Tissue Level of Organization

The middlemost embryonic germ layer to develop is

Which of the following is the proper sequence for neurulation?

The developing embryo, about 72 hours after fertilization, is called the zygote.

Eyes open and lungs develop.

The wall and lining of the gut develop from the mesoderm and , respectively.

Identical twins arise from the splitting of a three-layered embryo.

The gonads arise from what embryonic structure?

This is the most common preventable cause of mental retardation in the United States.

Somites differentiate into

Implantation of the blastocyst on the uterine lining takes about

The is the embryonic stage that implants in the uterus.

Which of the following is endodermal in origin?

Defects in the development of the neural tube may be linked to inadequate dietary intake of .

Mucus-producing glands of the respiratory tract arise from this layer.

Which of the following is not a property of mesenchyme?

The mesoderm located deep to the neural tube that forms the kidneys and the gonads is the

Male and female fetuses can first be distinguished by their genitalia at

The cavity in the mesoderm that ultimately develops into the peritoneal, pericardial, and pleural cavities is called

Premature birth is one that occurs 38 weeks after conception.

The splanchnic mesoderm forms next to this layer.