28. Pregnancy and Human Development

After fertilization, the zygote goes through a rapid period of cell divisions called __________.

The process of implantation generally begins __________ and is usually completed by __________.

Implantation is completed after the __________.

An implantation that takes place in a site other than the uterus is called __________.

Which of the following does NOT describe a function of trophoblast cells?

Implantation of the blastocyst begins __________ after ovulation.

By the end of the third month of pregnancy, the placenta is usually fully functional as a nutritive, respiratory, excretory, and endocrine organ.

Which of the following is NOT a function of the placenta?

Which statement about maternal hormones during pregnancy is accurate?

The disc-shaped placenta is formed from the __________.

Which hormone produced by the placenta causes the mother's pubic symphysis to loosen and widen?

What is the function of the hormone hCG (human chorionic gonadotropin)?

In humans, the extraembryonic membrane that composes the structural base for the umbilical cord is the __________.

The outermost extraembryonic membrane is the __________.

During early gastrulation, what structure(s) appear(s) on the dorsal aspect of the embryonic disc and establish(e)s the longitudinal axis of the embryo?

The ectoderm is the primary germ layer from which the digestive, respiratory, and urogenital systems and the associated glands form.

The development of the primary germ layers is called __________.

Which of the following structures is/are formed from ectodermal tissues?

The first major event of organogenesis is __________.

All of the following structures are derived from mesoderm EXCEPT __________.

The first major event in organogenesis is gastrulation.