Conception Flashcards
(39 cards)
Meiotic process by which male gametes are produced
spermatogenesis
Meiotic process by which female gametes are produced
oogenesis
production of sperm begins at puberty in response to _________ (male hormone)
testosterone
pH of sperm
slightly alkaline
helps neutralize the normally acidic female vagina
lifespan of sperm
48-72 hours after ejaculation
average time for sperm to travel to egg
4-6 hours; but can be as little as 5 minutes
oocytes form by ____ weeks of gestation
12
ovulation occurs _____ days before the next menstrual period
14 +/- 2 days
of chromosomes
46 total
23 from each parents
22 pairs of chromosome, leaving 2 chromosome to determine the sex
_____ secretes HCG to make sure that the corpus luteum remains viable
blastocyst
16 cells (3rd day)
first weeks of human development
morula
outer layer of cells; develops projections (chorionic villi)
(first weeks of human development)
trophoblast
inner layer of cells; outer layers are chorionic villi; implants 6-7days after fetilization
(first weeks of human development)
blastocyst
corpus luteum secretes _____ and ______ first 2-3 months of pregnancy
estrogen and progesterone
blastocyst is implanted ______ days after ovulation
6-8 days
site of implantation
upper portion of uterus
______ changes cervical mucus and endometrium to mature the uterine lining for implantation
progesterone
______ prevents pregnancy
progestin
(period/stage of growth)
conception to day 14
ovum
(period/stage of growth)
day 15 to 8 weeks
most critical time
organs are forming
embryonic stage
(period/stage of growth)
8 weeks to birth
fetus
(germ layer of cells)
trophoblast (outer layer) develops into the placenta, integument, neural tissue and glands
ectoderm
(germ layer of cells)
forms muscles, bones, connective tissue, circulatory system, and genitourinary system
mesoderm
(germ layer of cells)
digestive, respiratory, and parts of GU system formed
endoderm