Human Reproduction — BIOLOGY STD 12 Science — Question

→ During copulation (coitus) semen is released by the penis into the vagina (insemination).
→ The motile sperms swim rapidly, pass through the cervix, enter into the uterus and finally reach the ampullary region of the fallopian tube.
→ The ovum released by the ovary is also transported to the ampullary region where fertilisation takes place.
→ Fertilisation can only occur if the ovum and sperms are transported simultaneously to the ampullary region. This is the reason why not all copulations lead to fertilisation and pregnancy.