Lab 60

WHich of the following is NOT an extraembryonic membrane?

A. umbilical cord

______fluid protects the embryo from jarred movements and provides a watery environment for development.

Amniotic

The_____is the development stage that implants in the endometrium.

B. blastocyst

The embryonic stage of a human development exists

C. through the first eight weeks of development

______is the phase of development during which cellular divisions result in smaller and smaller cells.

Cleavage

The placenta is comprised of

D. combinations of the decidua basalis and chorionic villi

The ovum and sperm unite and form a diploid cell called the

D. zygote

A single completed oogenesis sequence produces four functional ova (eggs).

False

Part C A. Blastocyst B. Chorionic villi C. Endometrium D. Gastrula E. Morula F. Polar bodies G. Trophoblast H. Zona pellucida

H. Gel layer around oocyte and early cleavage stages A. Hollow ball of cells G. Develops into extraembryonic membranes E. Solid ball of sixteen cells B. Forms fetal portion of placenta C. Forms maternal portion of placenta D. Contains the ectoderm, endoderm, and mesoderm F. Small cells formed during meiosis that degenerate

A single completed spermatogenesis sequence produces four functional sperm.

True

The zona pellucida gel layer surrounds the secondary oocyte and early development stages through the morula.

True

The umbilical cord contains three blood vessels, two of which are_______.

arteries

A human offspring is called a(an)_____until the end of the eighth week of development.

embryo

After the eighth week, a developing human is called a(an)_____ until the time of birth.

fetus

Tiny cells that form during meiotic divisions of oogenesis and then degenerate are called_____.

polar bodies

Fertilization and early embryonic development occur within the lumen of a_____.

uterine tube

The cell resulting from fertilization is called a(an)_____.

zygote