Exam 4: Development

The heart forms and begins to beat during the _____ month of embryonic development.

On the diagram, 2 is pointing to the

The umbilical cord contains three blood vessels: two umbilical arteries and one umbilical vein.

The time from fertilization to birth is the gestation period-the first two months of which is the embryonic period.

A hollowed out ball of cells that implants into the endometrial lining is the _____.

The portion of the endometrium that will cover the embryo after implantation is called the _____ ___________.

Differentiation of the tissue of the embryo into the three primary germ layers begins _____ (before or after) implantation.

Developmental biology studies the sequence of events from fertilization of a _________________ by a sperm cell to the formation of an adult organism.

Which structure enters the uterine cavity approximately 4-5 days after fertilization?

_____ are the individual cells produced during cleavage.

During the reproductive years of a female, secondary oocytes are discharged from_____________into the peritoneal cavity each month (select all that apply)

The three primary germ layers develop from the _____ of the blastocyst.

The _____ forms all skeletal and cardiac muscle tissue and most smooth muscle tissue.

Which structure contains enzymes used to penetrate the protective layers of an ovulated oocyte?

Sperm must undergo _____ in the female reproductive tract in order to be attracted by and respond to chemical factors produced by the surrounding cells of the ovulated oocyte.

Fusion of the neural folds produces the _____, which will eventually give rise to the brain and spinal cord.

In the placenta, nutrients, gases, and wastes are exchanged between blood vessels of the chorionic villi and _____________ ______of the maternal portion of the placenta.

The number of somites that develop over a given period can be correlated to the approximate age of the embryo.

The structure(s) responsible for delivering oxygenated blood to the embryo (and later the fetus) from the placenta is/are the:

The opening of the uterus to the vagina through which sperm must enter to fertilize a secondary oocyte is known as the