Unit 4 (ch.29 hw) - Development, pregnancy, & hereditary

Fertilization usually occurs in the ________.

uterine tube/Fallopian tube

A patient is having contractions that are increasing in intensity and frequency, and her cervix is dilated. She is likely experiencing

TRUE labor

The process in which two sex cells fuse to form a new diploid cell is called _____.

fertilization

Each pronucleus contains a _____ number of chromosomes.

haploid

Select all that result in the end of labor and its positive feedback mechanism. - fetus is expelled from uterus - placenta is expelled from uterus - increased stretch on the cervix - increased oxytocin levels

ALL

During labor, oxytocin stimulates the uterus to contract. Contraction of the uterus increases pressure on the cervix, causing more oxytocin to be released from the hypothalamus. This is an example of ___________ feedback.

POSITIVE

Cleavage occurs

before implantation

Initially, sperm are not capable of fertilizing the oocyte. They must first undergo...

capacitation

What happens to the zona pellucida once a sperm cell has penetrated it?

it hardens

Why is capacitation of sperm important for their ability to fertilize the oocyte?

it is essential for proper ejaculation into the female reproductive tract

The placenta allows... A. oxygen and nutrients to diffuse from maternal blood to the embryo. B. carbon dioxide and other wastes to diffuse from the maternal blood to the embryonic blood. C. maternal blood to mix with fetal blood. D. the fetus to enlarge without rupturing the mother's abdomen.

oxygen and nutrients to diffuse from maternal blood to the embryo

Nutrients and wastes are exchanged between mother and fetus through the

placenta

Cleavage occurs during the _______ stage.

pre-

Which allows sperm to penetrate the zona pellucida?

the acrosomal reaction