Exam 29: Human Development and Aging

Regarding fertilization,which of the following events happens first?

The fossa ovalis is a remnant of the __________ of the fetus.

During implantation,the trophoblast divides into a superficial layer called the __________,which is composed of a multinucleate mass of cytoplasm.

Senescence begins at different ages and progresses at different rates in different organ systems.

As it implants,the conceptus is nourished by means of __________.

The _________ begins to develop about 11 days after conception,and is the sole source of fetal nutrition from the end of week 12 until birth.

Which of the following is not a derivative of ectoderm?

The most likely outcome of nondisjunction is the production of a gamete receiving __________.

Which of the following is not a reason muscular weakness tends to develop in old age?

Which of the folllowing lists the stages or structures of prenatal development in the correct order?

Trophoblastic nutrition refers to the nutrition of the conceptus before it implants.

The fertilization membrane is the endometrial tissue that receives the conceptus.

Neonatal immunity depends on IgG and IgA acquired through the placenta and colostrum,respectively.

Mesenchyme gives rise to __________.

Which of the following is not a known cause of congenital anomalies?

The first body cavity is called the __________.

The __________ encloses all the rest of the membranes and the embryo.

By the end of 8 weeks,the individual is considered a fetus because __________.

In the blastocyst,the trophoblast will become __________,whereas the embryoblast will become __________.

A teratogen is most likely to cause __________.