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Test 7
eighth pg of notes
44
Anatomy
11th Grade
04/14/2016

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Term
fertilized egg cell
Definition
zygote
Term
through eight week
Definition
embryo
Term
ninth week until birth
Definition
fetus
Term
What is male with a sperm count below 20 million per millimeter?
Definition
functionally sterile
Term
Since only one sperm fertilizes oocyte, why are additional sperm required?
Definition
because one sperm does not contain enough acrosomal enzymes to disrupt corona radiate of follicle cells that surround oocyte
Term
What enzyme breaks down bonds between follicle cells?
Definition
hyaluronidase
Term
What does the sperm that gets there first do?
Definition
binds to zona pellucida and forms a barrier that no other sperm can penetrate
Term
What part of the sperm enters the oocyte?
Definition
the head containing the DNA nucleus and the tail breaks off
Term
sequence of cell divisions that occur immediately after fertilization
Definition
cleavage
Term
When does cleavage end?
Definition
when blastocyst contacts uterine wall
Term
attachment of blastocyst to endometrium of uterus and continues as it invades maternal tissues
Definition
implantation
Term
complex organ that permits exchange between maternal and embryonic circulatory systems, supports fetus in 2nd and 3rd trimesters, secretes hormones, is expelled at birth
Definition
placenta
Term
identical cells produced by cleavage divisions (first division is completed about 30 hours after fertilization)
Definition
blastomeres
Term
What happens after 3 days of cleavage?
Definition
morula usually reaches uterus on day 4
Term
Over the next couple of days after 3 days of cleavage, a hollow ball of cells is formed called what?
Definition
blastocyst
Term
surrounds and cushions developing embryo and fetus
Definition
amniotic fluid
Term
Why isn't there any mixing of maternal and fetal blood?
Definition
the two are alway separated by layers of trophoblast
Term
What happens as the first trimester comes to an end?
Definition
the fetus moves farther from placenta but remains connected to it by the umbilical cord
Term
What is a hormone that appears in maternal bloodstream soon after implantation has occurred?
Definition
human chorionic gonadotropin
Term
What is the presence of hCG in blood or urine?
Definition
pregnancy
Term
What does the placenta actively secrete?
Definition
both estrogens and progesterone
Term
What is recreated by the placenta and corpus lute?
Definition
relaxin
Term
What does realaxin do?
Definition
increases flexibility of symphysis pubis, permitting pelvis to expand during delivery, causes dilation of cervix, suppresses release of oxytocin (delays contractions)
Term
termination of pregnancy
Definition
abortion
Term
miscarriage- result from developmental problems or hormonal problems (15% of pregnancies)
Definition
spontaneous abortion
Term
continuing pregnancy poses a threat to life of mother
Definition
therapeutic abortion
Term
performed at woman's request (first 3 months)
Definition
induced abortion
Term
What happens when the amniotic chorionic membrane ruptures?
Definition
water breaks
Term
perineal musculature to avoid perineal tearing of mother
Definition
episiotomy
Term
28-36 weeks with a birth weight of over 1kg or 2.2 pounds and has a good chance of surviving and developing normally
Definition
premature delivery
Term
when legs or buttocks enter the vaginal canal first (3-4% of deliveries)
Definition
breech births
Term
What is the scientific term for fraternal twins?
Definition
dizygotic
Term
What occurs when 2 separate oocytes are ovulated and both are fertilized (70% of twins)?
Definition
dizygotic or fraternal twins
Term
What is the scientific term for identical twins?
Definition
monozygotic
Term
one large oocyte divides into two identical individuals, conjoined or siamese twins may occur if splitting is not complete and they share a portion of skin, liver, or other organs
Definition
monozygotic or identical twins
Term
birth to 1 month
Definition
neonatal period
Term
after 1 month-2 years
Definition
infancy
Term
What is produced the first 2-3 days of an infant's life and it contains more proteins and less fat than true breast milk- proteins that are antibodies that may help ward off diseases?
Definition
colostrum
Term
aging
Definition
senescence
Term
your chromosomes and genes that make them up
Definition
genotype
Term
traits, anatomical and physiological characteristics
Definition
phenotype
Term
factors that result in abnormal development (drugs, including some antibiotics, alcohol, nicotine in cigarette smoke)
Definition
teratogens
Term
XX
Definition
female
Term
XY
Definition
male
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