Biology Questions and Answers

Biology Questions and Answers

LH then stimulates the formation of the

corpus lutcorpus luteum. Aroeum is alreaund 7 o’clock thdy secreting ae (^)
great amount of estrogen and
progesterothickens even more, cone and the endometriumncomitant
lowering of FSH and LH occurs with the
increasing oAround 11 o’clock thf the ovariae reduced LH andn hormones. (^)
FSH levels make the corpus luteum turn
into the corpus albicans,of estrogen and progestero the productionne ceases
and the endometrium regresses. At 0
o’clock again (28th dendometrium desquamates aay) the (^) nd a new
menstrual cycle begins.

26. In general what is the
    phase of the menstrual cycle
    when copulation may lead to
    fecundation?

Although this is not a rule, to beeffective fecundation in general must (^)
occur within aovulation (that occurs arobout 24 hours afterund the 14th (^)
day of the menstrualFecundation may occur e cycle).ven if (^)
copulation took place up to 3 days
before ovulation remain viable for about 72 since the male ghours withinametes
the female reproductive system.
The fertile period of the women howeveris considered the period from 7 days
before ovulation ovulation. to 7 days after

27. What is the part of the
    female reproductive system
    where fecundation occurs?
    FecundatioFallopian tubes but n generally occurs in theit can also take
    place within twhen fecundation may occur he uterus. There are caseseven
    before the ovum enters the uterine

tube, a fact that may leamedical condition known as ad to a bdominalsevere (^)
pregnancy.

28. How does the sexual
    arousal mechanism in women
    facilitate fecundation?
    During sexual arousal in women the
    vagina secretits acidity thus allowing es substances to nthe survivaleutraliz of e
    sperm cells within it. During the female
    fertile pthat coveriod hormones makers the internal surface oe the mucusf the
    uterus less viscous to help the passage

of sperm cells to thDuring copulation the uterine tubes.e uterine cervix (^)
advances inside the vagina to facilitate
the entering of male gametes throthe cervical canal. ugh

29. What is nidation? In which
    phase of the menstrual cycle
    does nidation occur?

Nidation embryo in the uterus. Nidatiois the implantantion on occursf the (^)
around the 7th day afti.e., 7 to 8 days after over fecundation,ulation
(obviously, it occurs only if fecundation
also occurs). Sincphase the progesteroe it occurs in tne level is high andhe luteal (^)
http://www.biology-questions-and-answers.com