Human Development
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Ovulation | The release of a mature egg from the ovary into one of the Fallopian tubes.
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| Fertilization | The fusion of a sperm and egg cell. *Only one sperm cell can successfully break through the egg's protective barrier.
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| Zygote | A fertilized egg. An embryo is formed.
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| Cleavage or Mitosis | Cellular division occuring over 6 to 7 days. cells double in number and decrease in size.
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| Blastocyst | A hollow ball of cells (approximatley 64 cells).
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| Implantation | When the blastocyst attaches to the wall of the uterus and begins to grow into the tissues of the mother.
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| Differentiation | The process in which cells become specialized in structure and function.
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| Gastrulation | Cell migration and development resulting in the formation of 3 cell-germ layers: ectoderm, endoderm, and mesoderm
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| Ectoderm | Outer-most germ layer; will develop into the skin and nervous system.
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| Endoderm | Inner-most germ layer; will develop into organs of the digestive system and respiratory system.
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| Mesoderm | Middle germ layer; will develop into muscles, bones, blood cells, and gonads.
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| Neurulation | The first step in the development of the nervous system; the ectoderm layer develops into the brain and spinal cord.
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| Placenta | The connecting organ between mother and embryo; source of respiration nourishment and excretion for the embryo
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| Embryo | Early development stage of a multicellular organism.
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| Fetus | A human embryo after 8 weeks of development (2 months).
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Or sort by any of the columns using the down arrow next to any column heading.
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Created by:
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