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Reproduction and development - Coggle Diagram
Reproduction and development
Topic 1: Gametes
Gametes are special cells adapted for reproduction. They have half the number of chromosomes that other cells have.
Egg cells are female gametes. They are large and contain food stores in their cytoplasm
Sperm cells are male gametes. They are small and have a tail for swimming.
Fertilizations happens when the sperm cell nucleus fuses with the egg cell nucleus. The cell is now a zygote
Topic 2: The human reproductive system
Sperm cells are made in the testes. They travel along the sperm duct into the urethra.
Egg cells are made in the ovaries. They travel along the oviduct, where they may be fertilized. They zygote travels into the uterus, where it develops into a baby.
Topic 3: Egg cell
If an egg cell is fertilized. the zygote divides to produce an embryo. The embryo travels to the uterus lining and develops into a foetus.
If an egg cell is not fertilized, it dies. The thick, spongy uterus lining is not needed, so it breaks down and is lost through the vagina. This is called menstruation.
Topic 4: From embryo to baby
The placenta is the growing embryo's life support system, allowing it to obtain food it's mother's blood.
The amnion is a bag surrounding the embryo, containing fluid which supports and protects it.
The embryo's organs have all developed by 11 weeks after fertilization. It is now a foetus.
Birth happens when the strong muscles in the uterus wall push the baby through the vagina
Topic 5: Growth and development
Growth happens as cells grow and divide repeatedly.
Adolescence is the time when a child gradually develops into an adult. Changes take place in the reproductive organs and the brain.