Lecture 12 Assignment Flashcards
When a sperm and an oocyte combine and their nuclei fuse, it is called
___________________________.
Fertilization
The ____________________ is an outer layer of follicular (granulosa) cells that form around a developing oocyte in the ovary
The corona radiata
The term used to describe penetration of the egg by more than one sperm is ____________________________________
polyspermy
The oocyte does not complete meiosis until what event occurs?
fertilization
Fraternal twins are referred to as ___________________________.
dizygotic twins
Each daughter cell produced by cleavage is called a _______________________.
blastomere
The cells that form the outer shell of the blastocyst that will develop into the chorionic sac and the fetal portion of the placenta are called ______________________.
trophoblast cells
The process where the blastocyst adheres to the uterine wall is called ________________________
implantation
The trophoblast secretes __________________________, a hormone that directs the corpus luteum to continue producing progesterone and estrogen.
human chorionic gonadotropin (hCG)
If the embryo implants outside of the uterus, the condition is called an ____________________________.
ectopic pregnancy
The spaces within the umbilical cord around the blood vessels are filled with a mucous connective tissue called what?
Wharton’s jelly
Sexual differentiation does not begin until the ____________________________.
fetal period
What is the cardiac shunt called that directly connects the right and left atria and avoids the pulmonary trunk altogether?
foramen ovale
What do we call the shunt within the pulmonary artery that diverts a portion of blood into the aorta?
the ductus arteriosus
A silky hair called _______________ covers the skin during development weeks 17–20.
lanugo
