Where does fertilisation take place in human beings? What changes occur in the egg cell (ovum) during fertilisation?

Vedclass pdf generator app on play store
Vedclass iOS app on app store
(N/A) In humans,fertilisation takes place at the ampullary-isthmic junction of the fallopian tube.
During copulation,semen is released into the vagina. The motile sperm swim rapidly through the cervix and uterus to reach the ampullary-isthmic junction.
The ovum released by the ovary is also transported to the same junction. Fertilisation can only occur if the ovum and sperms are transported simultaneously to this site.
During fertilisation,the following changes occur in the ovum:
$1$. When a sperm comes in contact with the zona pellucida layer of the ovum,it induces changes in the membrane that block the entry of additional sperms,ensuring that only one sperm fertilises the ovum.
$2$. The secretions of the acrosome help the sperm enter the cytoplasm of the ovum through the zona pellucida and the plasma membrane.
$3$. This entry induces the completion of the second meiotic division of the secondary oocyte,which is an unequal division resulting in the formation of a second polar body and a haploid ovum (ootid).
$4$. Finally,the haploid nucleus of the sperm and the haploid nucleus of the ovum fuse together to form a diploid zygote.

Explore More

Similar Questions

After implantation,finger-like projections on the trophoblast are called $...A....$ which are surrounded by $...B..$ and maternal blood. Here $A$ and $B$ refers to

The chemical substance found in the surface layer of cytoplasm of spermatozoa is

Blastocyst is a modified blastula of

Incomplete cleavage is a type of which division?

The sperm penetrates the ovum mainly by:

Vedclass Products

For Students

Vedclass Test Series

Mock tests in real JEE/NEET style with performance analysis. 5-day free trial.

Start Free Trial
For Teachers

Exam Paper Generator

Generate Set A/B/C/D exam papers from 7.5L+ questions in 2 minutes. 3 chapters free.

Try Free
For Institutes

Online Exam Module

Live online exams with unlimited students, 360° analytics & white-label branding.

See Demo