Question

Describe the event that takes place from transport of ovum , ferilisation and passage of growing embryo through fallopian tube.

Answer 1

Answer:

ENJOY THE JOURNEY OF SPERM TO THE OVUM.

When sperms reach fallopian tube (ampullary-isthmic junction) then it enters the secondary oocyte by penetrating the various layers like the layer of granulosa cells ,zona pellucida. When sperm enter the secondary oocyte then its tail break and head of sperms enters the ovum after that the nucleus of sperm and ovum fuse which form zygote.

Now the zygote divide mitotically and about 30 hours after fertilisation two cell stage reach, about 60 hours after four cell stage reach and about 72 hours after 8 cell state reach.

Now the zygote becomes morula and the morula reach the uterus about at 4th to 6th day. Divison takes place continuously and the morula become very compact and form blastula having more than 100 cells (remember even division takes place but the size of morula and blastula does not increase due to zona pellucida is intact).

Blastula reach the endometrial lining of uterus and the layer of zona pellucida starts disappearing and the secretion of the outermost layer of blastula help in the penetrating the endometrial lining of uterus and the implantation takes place.

Now various processes, hormonal changes, efforts of embryo help in the formation of a new baby and after nine month full term baby is delivered out (parturition).