Pregnancy Flashcards
Pregnancy refers to the events that
Occur from fertilization to birth
Day 1 of pregnancy is the time from
The first period
Fertilization refers to the events that turn the egg into a
Zygote
Oocyte is viable for
12-24 hours
Sperm is viable for
24-48 hours, but can last in the tract for up to 5 days
For fertilization to occur, sperm must be
Capacitated before penetration
Capacitation of sperm occurs when it
Comes across secretions in the tract
Capacitation allows for the weakening of the
Acrosomal membrane
The acrosome is found at the head of the sperm and contains
Hydrolytic enzymes (help for digestion of hole)
What happens during the Acrosomal Reaction?
Acrosomal enzymes break down the linings of the egg by going through corona and binding to zona
Zygote travels down fallopian tube and into the uterus in the span of
5-6 days
Cleavage occurs when
Zygote is on the way to the uterus
What is Cleavage?
Rapid mitotic division without intervening growth
In the single cell stage, the cell is a
Zygote
The Morula is the
Solid ball of blastomeres (3 days)
The Early Blastocyst is when the
Morula hollows out and fills with fluid
How is the Blastocyst that implants in the uterine lining?
It is a sphere of trophoblast cells and inner cell mass
What is the Blastocyst?
Pre-embryo that forms as its getting closer to uterus
Trophoblast cells release a hormone which
Signals ovaries to maintain corpus luteum
Implantation is completed by
12th day post-ovulation
Placentation is the
Formation of the placenta
Placentation is done with the contribution of
Embryonic and maternal material
What is the Placenta’s endocrine function?
It produces hormones to maintain pregnancy, lactation, and childbirth
The Placenta allows for the exchange of
Nutrients, gases, and waste for embryo
