Reproduction Flashcards
gamete
sex cell
zygote
fertilized egg
primary sex organs
produce gametes = gonads
testes and ovaries
essential
secondary sex organs
ducts gland and penis
uterine tubes, uterus, vagina
essential
secondary sex characteristics
not essential for reproduction but increase probability of sexual reproduction
beard; hair growth
Most cells have how many pairs of chromosomes? How many pairs are sex chromosomes
23 pairs total
1 pair
Who is responsible for determining the sex of the child?
Male
Androgen insensitivity syndrome
androgen receptors not responsive to testosterone/androgens
Which hormone is the basis for pregnancy tests?
Human chorionic gonadotropin
At less than 5 weeks a fetus is?
sexually undifferentiated
At 5-6 weeks, what develops near the fetus’ kidney?
gonadal ridges
If a fetus has a functioning HCG receptor they will become?
male
Sperm pathway
- testis
- epididymis
- vas deferents
- seminal vesicle
- prostate gland
- bulbourethral gland
- urethra
spermatogenesis
synthesis of sperm
occurs in testicles in the seminiferous tubules
If prostate gland is enlarge what is difficult?
urination
Germ cells are?
haploid
Spermatogonium Type A
remains outside the blood-testis barrier and continues to divide; maintain supply
Spermatogonium Type B
differentiates into primary spermatocytes by going through 2 rounds of meiosis
1 spermatogonium makes how many sperm?
4
The sperm has a lot of which organelle located in its mid piece?
mitochondria
Contraceptive Foam
impairs sperm motility
IUD
morena- progestin only; paraguard- copper based
prevent sperm motility and entrance into uterus
Seminiferous tubules
ducts in which sperm are made
Sertoli cells
protect sperm and promote development
stimulated by GnRH and FSH
Leydig Cells
make testosterone
stimulated by GnRH and LH
Blood-testis barrier
protect sperm from body
Efferent ductules
carry sperm to epididymis
epididymis
mature sperm and reabsorb old sperm
vas deferens
duct that delivers sperm to seminal vesicles
only one per testis
Vasectomy
each vas deferens is lighted to prevent pregnancy
irreversible in most cases
Seminal vesicles
1st gland sperm encounters
posterior to urinary bladder, associated with vas deferens
secrete 60% of the fluid found in semen
Prostate
2nd gland sperm encounters
surrounds urethra
secretes 30% of the fluid found in semen
Bulbourethral (Cowpers) Gland
found near end of penis
secrete clear, slippery fluid used to lubricate the tip of the penis and neutralize acidity of residual urine
secrete 10% of fluid found in semen
Semen
fluid expelled during orgasm
Spermatozoa
component of semen
normal levels 50-120 million sperm/mL
Fructose
component of semen
energy source (ATP)
Clotting and anti-coagulant factors help sperm to ?
stay in vagina and gain access to uterus egg
Prostaglandins help sperm to ?
contract the myometrium to gain access to the uterus
Spermine
base to neutralize vaginal pH to 7.4-7.6
Does sperm have decreased movement at high or low pH?
low
FSH and LH work together for ?
sperm production, maturation of primary and secondary sex organs, and secondary sex characteristics
Ovulation pathway
ovary -> fallopian tube -> uterus
Where do diaphragms and IUDs go? Where do pap smears occur?
Cervix of the uterus
ovary
egg development and maturation
Fallopian tube
receives egg; allows for transport of egg to uterus
Uterus
thick muscular chamber that opens to the top of the vagina
acts as a storage depot for embryo/unfertilized egg
made up of fundus, body and cervix
lumen, myometrium, endometrium
Myometrium responds to
oxytocin and prostaglandins
endometrium responds to
estrogen and progesterone
Oogenesis
synthesis of eggs in ovary
Oogonia multiply until the 5th month of gestation and then
go into a state of rest until birth to make egg
Only when what occurs do the ovum go through meiosis 2
fertilization
During puberty FSH causes the primary oocyte to complete?
meiosis 1
1 oogonium makes how many mature eggs?
1
What does FSH stimulate?
ovulation, estrogen production, breast maturation
What does LH stimulate?
progesterone, breast maturation, and uterine lining maintenance
Thelarche
breast development
Pubarche
pubic and auxiliary hair development
Menarche
1st menstrual cycle
Barrier and spermicidal methods
prevent sperm from getting into/beyond the vagina
diaphragm
rubber cap placed over cervix
spermicides
foams that kill/prevent sperm motility
hormonal methods
contain endogenous hormones to turn off production of FSH by negative feedback
decreases ovulation and egg development
Mirena
IUD containing progesterone
inhibits ovulation , decreases FSH and changes the endometrial lining
Paragard
IUD containing copper
changes endometrial lining
makes it unfavorable for ovum and sperm transport throughout the uterus
Vasectomy
ligation of vas deferens
prevents spermatozoa from being in sperm
Tubal ligation
tying off fallopian tubes
prevents egg transport to uterus
Prevent blastocyst implantation into uterine wall using ?
a progesterone receptor antagonist
rhythm method
timing of intercourse to reduce chances of pregnancy
1-13 least likely (egg in ovary)
14-24 most likely (egg in tube/uterus)
Failure rate of no protection
85%
Failure rate of rhythm method
20%
failure rate of withdrawal
18%
Failure rate of spermicide
21%
failure rate of condom
12%
failure rate of diaphragm with spermicide
18%
failure rate of birth control pill or IUD
3%
failure rate of norplant
0.2-0.4%
failure rate of depo-provera
0.3-0.4%
failure rate of vasectomy
0.15
failure rate of tubal ligation
0.4%