fertilization Flashcards
what is a gamete?
specialized sex cells that contain half of the genetic material of a normal human cell (sperm and egg)
how many chromosomes does each sperm have?
23
how many chromosomes does each egg have?
23
do sperm and egg cells have the same amount of chromosomes?
yes
where does fertilization normally occur?
fallopian tubes
what is the path of sperm cell once it has entered the vagina?
vagina->cervix->uterus->one of the fallopian tubes
how does fertilization occur?
the fastest/healthiest sperm cells reach the egg, sperm contains chemical that breaks down coating around egg, several sperm cells burrow into the covering to make a hole for one to enter, once it enters it leaves its tail outside and a chemical change prevents more from entering
when is fertilization most likely to occur?
ovulation
can a woman only get pregnant during ovulation?
no
what is a zygote?
fertilized egg
what happens to egg after fertilization?
after the zygote travels to the uterus it attaches to the lining of the uterus and becomes a blastocyst
what is prenatal care?
taking care of yourself and the baby as a pregnant mother (eg, no alcohol/drugs, no raw fish, no smoking)
what are causes of infertility?
-irregular ovulation
-low sperm count
-poor swimming sperm
-blocked fallopian tubes
-old eggs
define embryo
developing baby (up to 8 weeks)
define fetus
developing baby after 8 weeks
define placenta
blood-rich organ that nourishes the developing baby
define umbilical cord
connects baby to placenta