Embryo - Wikipedia
网页An embryo is the initial stage of development for a multicellular organism. In organisms that reproduce sexually, embryonic development is the part of the life cycle that begins just after fertilization of the female egg cell by the male sperm cell.
Embryo vs. Fetus: What’s the Difference? - Healthline
网页2023年4月12日 · The embryonic period is all about the formation of important systems of the body. Think of it as your baby’s basic foundation and framework. The fetal period, on the other hand, is more about...
Fetal Development: Week-by-Week Stages of Pregnancy
网页2024年3月19日 · Fetal development is an orderly and intricate process. It begins before you even know you’re pregnant and ends with the birth of your baby. Between conception and delivery, there are many detailed steps that have to occur. There are three stages of fetal development: germinal, embryonic and fetal.
Embryo | Human & Animal Characteristics | Britannica
网页2024年8月25日 · 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 …
Human embryonic development - Wikipedia
网页v. t. e. Human embryonic development or human embryogenesis is the development and formation of the human embryo. It is characterised by the processes of cell division and cellular differentiation of the embryo that occurs during the early stages of development.
Embryo - Definition, Development, Stages and Quiz | Biology ...
网页2017年7月6日 · 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.
Stages of Fetal Development | Ask A Biologist
网页Not only do embryos get bigger during that time, but they also go from being just a simple, single, cell to being the many cells that make up a human. All of a human’s features, organs, and body systems form when they're in the womb. Let’s learn more about how embryos form, and how they grow throughout pregnancy. Trimester 1
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