development- book Flashcards
the reproductive cells of the body are called?
gametes
haploid cells have how many chromosomes
23
the reproductive cells of the body are produced by what process
meiosis
in meiosis what stage is skipped in between divisions
interphase
after sperm cells are released they undergo a change called
capacitation
after ovulation the oocyte must be fertilized within how many hours
24
the oocyte is moved through the uterine tubes by the
cilia
the sperm cells are attracted to the oocyte by a process called
chemotaxis
sperm and oocyte unite through what process
fertilization
the cell resulting from the union of the sperm and oocyte is
zygote
the oocyte is surrounded by a protective barrier of cells called the
corona radiate
the germinal period covers what weeks of development
first 2
weeks 2-8 are what period of development
embryonic
how long after fertilization does implantation occur
7 days
the placenta and chorion will develop from the
trophoblast
the organ responsible for the swapping of materials between the mother and fetus is the
placenta
the layer which invades the uterine wall is the
syncytiotrophoblast
the linings of the lungs and GI tract will develop from which germ layer
endoderm
skeletal muscles and bones will develop from which germ layer
mesoderm
the epidermis will develop from which germ layer
ectoderm
skeletal muscles will develop from immature cells called
myoblasts
the upper and lower limbs will begin to develop at the beginning of what week
4
before birth there is a hole between the two atria called the
foramen ovale
the second stage of labor involes
the baby exciting the body
