ANP 1107A Reproductive System Lecture Four Flashcards

1
Q

how long after ovulation is an egg capable of being fertilized

A

-12-24 hours

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2
Q

how long is sperm viable in the reproductive system

A

-one week
-fertilization is 24-48 hours

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3
Q

what is capacitation

A

-change in sperm that typically occurs inside the womans body

-require before fertilization can occur

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4
Q

what happens to sperm after capcitation?

A

-increased rate of flagerllar
-accelerated motility pattern

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5
Q

what does seminal fluid contain?

A

capacitation inhibiting factors

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6
Q

skip

A

skip

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7
Q

Why is it important that this happens only after sperm have bound to the
zona pellucida?

A

if enzymes are released before sperm binds = no chance of fertilization

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8
Q

what is polyspermy?

A

-egg that has been fertilized by more than one sperm
-not viable because there are more than two copies of each chromosome

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9
Q

what happens to the oocyte after one sperm goes through?

A

-hardening of zona pellucida
-clipping off sperm receptors to avoid polyspermy

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10
Q

fast block to polyspermy

A

oocyte membrane block

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11
Q

slow block to polyspermy

A

crotical reaction

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12
Q

when does meoisis resume?

A

after the sperm penetrates the secondary oocyte

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13
Q

what is pronucleus?

A

nucleus of sperm/egg post-fertilization but prior to fusion

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14
Q

when does the zygote form?

A

when chromosomes from male and female intermix

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15
Q

what is a zygote?

A

a diploid cell from the fusion of two haploid gametes

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16
Q

what is a blastocyst?

A

a hollow ball of cells with a cluster of cells inside known as the inner cell mass

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17
Q

what structure hatches from the zona pelluicda?

A

blastocyst

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18
Q

when does implantation occur?

A

6 days after fertilization

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19
Q

what is the trophoblast?

A

cells forming from the outer layer of the blastocyst

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20
Q

what does the trophoblast become?

A

placenta

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21
Q

what does the inner cell mass become?

22
Q

when is implantation complete?

23
Q

at 4.5 weeks, what can be seen from the embryo?

A

-limb buds
-eyes and mouth
-cardiovascular system

24
Q

what is the yolk sac?

A

-source of red blood cells for fetus

25
when is the germinal period?
conception to 2 weeks
26
when is the embyronic period?
3-8 weeks
27
when is the fetal period?
9 weeks to term
28
what period is most impacted by teratogens?
embyronic period
29
structures of the endoderm?
-epithelial linings of digestive -respiraotry tracts
30
structures of the mesoderm?
-kidneys -heart -blood vessels -CT of limbs
31
what structures arise from the ectoderm?
-epidermis -brain -spinal cord -hair -nails
32
what is placentation?
formation of placenta
33
maternal and fetal blood supplies not
in direct contact - nutrients, gasses, wastes diffuse through trophoblast layer mesenchyme fetal capillary endothelium
34
normal term placenta is?
~500g measures 15-20 cm, 2-3 cm thick
35
how many arteries and veins does the umbilical cord have?
2 arteries 1 vein
36
what is the foramen ovale?
opening between right and left atria
37
what is the ductus venosus?
shunt from umbilical cord bypasses liver and takes blood straight to the brain and heart
38
umbilical arteries are
dexygeneted
39
umbilical veins are
oxygenated
40
what hormone is made exclusively in the placenta
human choronic gondatropin
41
when is hCG present in maternal fluid?
3-8 days after fertilization
42
function of hCG?
-stimulates production of estrogen and progesterone by CL -maintain pregnancy until placenta takes over at 12 weeks
43
without hCG, what would degenerate?
corpus luteum
44
pregnancy tests used today test the presence of what?
human choronic gonadotropin hCG
45
human placental lactogen (hPL) is similar to what?
human choronic somatommotropin (hCS)
46
when does the placenta start ot secrete hCS?
first trimester levels increase until delivery
47
what does hCS do?
-breast developing in preparation for postnatal lacation -supports fetal bone growth -makes glucose avilable to fetus by reduce insulin sensitity
48
what is gestational diabetes?
abnromal blpud glucose maintance during pregnancy - leads to temporary diabetes
49
what does the placenta convert circulating androgens to?
estrogen
50
what does estrogen do
- maintains uterine enometrium - breast development
51
when is blood pressure lowest for a pregnant mother?
24 weeks
52
what is myocardial hypertrophy?
increase in workload = thickening in muscle