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Reproduction in Humans

How animals give rise to new individuals of their own kind — from fission and budding to the human reproductive system, pregnancy and birth.

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What this chapter covers

  1. Reproduction Overview

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    • Types of ReproductionAsexual reproduction; sexual reproduction fuses gametes.
    • Sexual Reproduction in AnimalsSperm and ovum fuse into zygote.

  2. Asexual Reproduction in Animals

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    • FissionParent body divides into new individuals.
    • BuddingBuds grow and detach; e.g. Hydra.
    • RegenerationRegrowing lost parts; Hydra, Planaria, Starfish.

  3. Human Reproductive System

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    • Female Reproductive SystemOvaries, oviducts, uterus, vagina and vulva.
    • Male Reproductive SystemTestes, ducts, accessory glands and urethra.

  4. Pregnancy and Development

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    • FertilisationOne sperm fertilises egg in oviduct.
    • ImplantationEmbryo embeds in the uterine lining.
    • GrowthCell division and differentiation form organs.
    • BirthGestation about 280 days, then birth.

Try a sample question

How many sperms fertilise a single egg in humans?

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