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Mar 8, 2024 · Embryo, the early developmental stage of an animal while it is in the egg or within the uterus of the mother. In humans the term is applied to the unborn child until the end of the seventh week following conception; from the eighth week the unborn child is called a fetus.
Aug 13, 2023 · An embryo refers to the early developmental stage of a multicellular organism that follows fertilization. This stage represents a crucial juncture in the life cycle, transitioning from a single fertilized cell into a complex organism with specialized tissues and structures.
Jul 6, 2017 · Embryo Definition. An embryo refers to the early developmental stage of eukaryotic organisms following the fertilization of an egg (derived from a female) by sperm (derived from a male) as a method of sexual reproduction.
Aug 18, 2023 · NEWS. 18 August 2023. What is an embryo? Scientists say definition needs to change. Lab-grown structures with the potential to develop into fetuses should be defined — and regulated — as embryos,...
Key terms. What happens during pregnancy? Have you ever wondered why a typical human pregnancy lasts about 9 months? What goes on in there? Do all animals carry their babies for 9 months? 20 22. The embryo develops within the womb during this period. First, stem cells in the inner cell mass of the implanted blastocyst begin to differentiate.
Embryogenesis, the first eight weeks of development after fertilization, is an incredibly complicated process. It’s amazing that in eight weeks we’re transforming from a single cell to an organism with a multi-level body plan. The circulatory, excretory, and neurologic systems all begin to develop during this stage.
Embryology, the study of the formation and development of an embryo and fetus. Before widespread use of the microscope and the advent of cellular biology in the 19th century, embryology was based on descriptive and comparative studies. From the time of the Greek philosopher Aristotle it was debated.
