Class 10 Biology How Do Organisms Reproduce Fertilization in Human beings

Fertilization in Human beings

Fertilization is internal in human beings

  • This process occurs in the fallopian tube
  • Ovum comes from ovary to Fallopian tube. Unfertilized egg remains alive for approx. 24 hours
  • Sperms enter through vagina and reach the Fallopian tube. Sperm must fertilize the egg within the above time.
  • Sperm enters the egg
  • Fusion of nucleus of sperm & ovum is termed as Fertilization

  • Fertilization leads to the formation of single-celled Zygote
  • Zygote undergoes repeated divisions, and gets implanted in the uterus. This is now called as Embryo. Embryo in advanced stages of development is termed as Foetus.
  • Uterus also prepares itself to receive the embryo. It thickens its walls. Embryo descends into uterus in 4-5 days from the day of fertilization.
  • Embryo in the uterus receives nutrients from the mother’s body through the Umbilical cord which in turn is connected to the uterine wall of mother through Placenta. Placenta: is a structure formed by specialized tissues of fetus & uterine wall of mother.
  • Nutrients enter through this cord, and wastes go out of the foetus body. Umbilical cord also has arteries & veins for exchange of oxygenated and deoxygenated blood.

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