1st week of development Flashcards
T or F
1st Week of Development is the Ovulation to Implantation
Oogenesis is not complete until reproduction occurs
TRUE
The series of changes in the ovary
Ovarian Cycle
Three Phases of the ovarian Cycle
Three Phases: Follicular, Ovulation, Luteal
T or F
High estrogen levels - increases the release of FSH
and LH
FALSE
High estrogen levels - inhibits the release of FSH
and LH
GnRH → release of FSH and LH (what phase?)
Follicular Phase
Release of a mature oocyte into the fallopian tubes
Ovulation
What Usually occurs at Day 14 of the cycle
Ovulation
T or F
Sudden LH surge at day 14, without the sudden
surge, ovulation will still happen
FALSE
Sudden LH surge at day 14, without the sudden
surge, ovulation will not happen
Transforms ruptured follicle into corpus luteum
Luteal
What secretes a significant amount of
progesterone, which make the endometrium of the uterus ready for implantation
Corpus Luteum secretes a significant amount of
progesterone, which make the endometrium of the
uterus ready for implantation
In the luteal phase, Corpus Luteum becomes the?
Corpus Luteum becomes the Corpus Albicans
T or F
Corpus albicans: the degraded corpus luteum
TRUE
The ___is extremely thick as this
prepares the body for pregnancy
The endometrium is extremely thick as this
prepares the body for pregnancy
Occurs in the ampullary region of the uterine tube
Fertilization
T or F
In ovulation phase, sperms have a hard time to swim entering the isthmus fallopian tube
FALSE
In follicular phase, sperms have a hard time to swim entering the isthmus fallopian tube
T or F
In ovulation, the sperm cells have an easier time to
swim due to the chemoattractants
TRUE
The trip of the sperm cell from cervix to oviduct can occur as rapidly as __minutes or as slow as __ days
The trip of the sperm cell from cervix to oviduct can
occur as rapidly as 30 minutes or as slow as 6 days
Period of conditioning in the female
reproductive tract, the sperm needs to
get used to the environment
Capacitation
How lng does Capacitation last?
Lasts approximately for 7 hours
T or F
Only capacitated sperm can undergo
acrosome reaction
TRUE
Contents of the acrosome are released
outwardly
Acrosome Reaction
Release of enzymes needed to
penetrate the zona pellucida, which is
one of the barriers in the egg cell
Acrosome Reaction
T or F
Acrosome is the protein
FALSE
Acrosome is the enzyme
Phases of Fertilization
Phase 1 - Penetration of the Corona Radiata
Phase 2 - Penetration of the Zona Pellucida
Phase 3 - Fusion of the oocyte and sperm cell
membranes
Cleavage refers to division
o This aids in rapid cell division that leads to a
multicellular embryo
Phase 3 - Fusion of the oocyte and sperm cell
membranes
Releases the enzyme acrosome to enter zone of pellucida
o The phase where it needs acrosome
Phase 2 - Penetration of the Zona Pellucida
Only the capacitated sperm can pass freely to
the corona radiata
Phase 1 - Penetration of the Corona Radiata
Initiation of cleavage
a. Rapid cell division that leads to a multicellular
embryo
b. Zygote, eight-cell, blastula, cross section of
blastula
T or F
Determination of the sec of the new individual
a. The first 22 chromosomes are autosomes
b. The 23rd chromosome is the sex hormone
TRUE
16-cell embryo composed of inner and outer cells
Morula
Forms into a blastocyst
Morula
Inner cell mass is the
embryoblast
Outer cell mass is the
Outer cell mass is the trophoblast
