Week 1: Embryology Questions with Correct Answers
WEEK 1 OF DEVELOPMENT Correct Answer-WEEK 1 OF
DEVELOPMENT
On average, how long does human embryonic development take?
Correct Answer-38 weeks
when does development begin? Correct Answer-fertilization
embryonic period Correct Answer-the first 8 weeks of development after
fertilization; when basic human systems in body are established
fetal period Correct Answer-last 30 weeks of development after
fertilization
where does development begin? Correct Answer-female reproductive
system
oocyte Correct Answer-egg that is a haploid cell, containing only 1 copy
of each chromosome, develops in ovary
olvulation Correct Answer-once every month, female ovulates an oocyte
that goes down fallopian tube and expelled or implanted in uterus
,how is the oocyte transported to uterus? Correct Answer-by muscular
contractions of the fallopian tube and the cilia lining of the tube
where is the cite of implantation of the oocyte? Correct Answer-the
uterus
how long does oocyte remain viable in the fallopian tube for? Correct
Answer-12 hours after ovulation before it gets expelled (during this
time, the sperm is attracted to it)
zona pellucida Correct Answer-thick extracellular matrix/plasma
membrane that surrounds the oocyte
corona radiata Correct Answer-additional layer of cells that surround
oocyte for protection and supplies vital proteins to cell
sperm Correct Answer-haploid cells attracted to oocyte
how do sperm fertilize the egg? Correct Answer-enzymatically digest a
pathway through zona pelludica and chorona radiata to fertilize the
oocyte
how many sperm can fertilize one egg? Correct Answer-only 1 sperm
where does the sperm fertilize the egg? Correct Answer-the lateral half
of the fallopian tube
, where on the egg does the sperm fertilize it? Correct Answer-sperm
binding proteins on the oocyte's plasma membrane
how are other sperm prevented from fertilizing the egg after its already
been fertilized? Correct Answer-they are inhibited by chemical changes
induced in zona pellicuda after the first sperm has entered
1. sperm binding proteins are taken off
2. calcium is secreted, which causes zona pollusa membrane to harden,
ending up like an egg shell, preventing any other sperm from digesting
their way through the ooctye membranes
describe the contribution of cytoplasm by the oocyte and sperm to the
fertilized egg Correct Answer-small amount of cytoplasm derived form
the sperm compared to the huge amount derived from oocyte
describe the contribution of genetic material from ooctye and sperm to
the fertilized egg Correct Answer-they contribute equally
how long does nuclear fusion of sperm and egg take? Correct Answer-12
hours
when/where does the first mitotic division of ooctye occur? Correct
Answer-before fertilization while its still in ovary
WEEK 1 OF DEVELOPMENT Correct Answer-WEEK 1 OF
DEVELOPMENT
On average, how long does human embryonic development take?
Correct Answer-38 weeks
when does development begin? Correct Answer-fertilization
embryonic period Correct Answer-the first 8 weeks of development after
fertilization; when basic human systems in body are established
fetal period Correct Answer-last 30 weeks of development after
fertilization
where does development begin? Correct Answer-female reproductive
system
oocyte Correct Answer-egg that is a haploid cell, containing only 1 copy
of each chromosome, develops in ovary
olvulation Correct Answer-once every month, female ovulates an oocyte
that goes down fallopian tube and expelled or implanted in uterus
,how is the oocyte transported to uterus? Correct Answer-by muscular
contractions of the fallopian tube and the cilia lining of the tube
where is the cite of implantation of the oocyte? Correct Answer-the
uterus
how long does oocyte remain viable in the fallopian tube for? Correct
Answer-12 hours after ovulation before it gets expelled (during this
time, the sperm is attracted to it)
zona pellucida Correct Answer-thick extracellular matrix/plasma
membrane that surrounds the oocyte
corona radiata Correct Answer-additional layer of cells that surround
oocyte for protection and supplies vital proteins to cell
sperm Correct Answer-haploid cells attracted to oocyte
how do sperm fertilize the egg? Correct Answer-enzymatically digest a
pathway through zona pelludica and chorona radiata to fertilize the
oocyte
how many sperm can fertilize one egg? Correct Answer-only 1 sperm
where does the sperm fertilize the egg? Correct Answer-the lateral half
of the fallopian tube
, where on the egg does the sperm fertilize it? Correct Answer-sperm
binding proteins on the oocyte's plasma membrane
how are other sperm prevented from fertilizing the egg after its already
been fertilized? Correct Answer-they are inhibited by chemical changes
induced in zona pellicuda after the first sperm has entered
1. sperm binding proteins are taken off
2. calcium is secreted, which causes zona pollusa membrane to harden,
ending up like an egg shell, preventing any other sperm from digesting
their way through the ooctye membranes
describe the contribution of cytoplasm by the oocyte and sperm to the
fertilized egg Correct Answer-small amount of cytoplasm derived form
the sperm compared to the huge amount derived from oocyte
describe the contribution of genetic material from ooctye and sperm to
the fertilized egg Correct Answer-they contribute equally
how long does nuclear fusion of sperm and egg take? Correct Answer-12
hours
when/where does the first mitotic division of ooctye occur? Correct
Answer-before fertilization while its still in ovary
