Biology Questions and Answers
the endometrium is in its best condition
to receive the embryo.
- What is tubal pregnancy?
Many times fthe Fallopian ecundation takes ptubes. Generally the newlylace in (^)
formed zygote is taken to thwhere nidation and the embryonice uterus
development occur. In some cases
however the zygote canthe uterus and the embryo implantsnot go down to
itself in the uterine tube tissue,
characterizinTubal pregnancy is a severe clinicalg the tubal pregnancy. (^)
condition since often the tube ruptures
during gestation causing and even death of the womahemorrhagen. The most (^)
common treatment for tubal pregnancy
has been surgery.
- How do hormonal tests to
detect pregnancy work?
Laboratory testscommonly test for human ch to detect pregnancyorionic
gonadotropin (HCG) concentration in
blood or urine samplthis hormone is abnormally hies. If the level ofgh,
pregnancy is likely.
- Does the hypophysis-
ovaries endocrine axis work in
the same way during
pregnancy as in non-pregnant
women? If pregnancy does
not occur how does another
menstrual cycle begin?
The functioning of the hypophysis isaltered during pregnancy. Sinceestrogen and progesterone levels (^)
remain elevated during the gestational
period the production o(gonadotropin-releasing f GnRHhormone) from (^)
the hypothalamus is inhibited. The lack
of GnRH thFSH and LH from the hypophysis and aus inhibits the secretion of (^)
new menstrual cycle does not begin.
If pregnancy does not occur thlowering of estrogen and progesterone (^) e
levels stimulatesGnRH by the hypothalamus. T the production ohis f
hormone then hastens thadenohypophyseal secretioe (^) n of FHS and
LH that in their turn stimulate the
maturation of a new menstrualof follicles cycle. and the beginning
- What is the endocrine
function of the placenta?
The placenta besides being the organthrough which the exchange of
substancesfetus is done also has th between the mothe function er and theof
secreting estrogen and progesterone to
keep a high level of these hormonesduring pregnancy. (The placenta still (^)
secretes other hormones like human
placentalthe hypophyseal h lactogen, that actormones that r similarlyegulate to (^)
reproduction, and HCG, human
chorionic gonadotropin.)
- How do contraceptive pills
generally work?
Contraceptive hormones estropills generally contain thgen and progesterone. Ife (^)
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