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Human embryonic development refers to the development and formation of the human embryo. It is characterised by the process of cell division and cellular differentiation of the embryo that occurs during the early stages of development. In biological terms, human development entails growth from a one-celled zygote to an adult human being.
Pages in category "Human life stages" The following 7 pages are in this category, out of 7 total. This list may not reflect recent changes. A. Āśrama (stage) D.
Human embryology is the study of this development during the first eight weeks after fertilization. The normal period of gestation (pregnancy) is about nine months or 36 weeks. The germinal stage refers to the time from fertilization through the development of the early embryo until implantation is completed in the uterus .
In biology, a biological life cycle (or just life cycle when the biological context is clear) is a series of stages of the life of an organism, that begins as a zygote, often in an egg, and concludes as an adult that reproduces, producing an offspring in the form of a new zygote which then itself goes through the same series of stages, the ...
The eukaryotic cell cycle consists of four distinct phases: G 1 phase, S phase (synthesis), G 2 phase (collectively known as interphase) and M phase (mitosis and cytokinesis). M phase is itself composed of two tightly coupled processes: mitosis, in which the cell's nucleus divides, and cytokinesis, in which the cell's cytoplasm and cell membrane divides forming two daughter cells.
It posits eight sequential stages of individual human development influenced by biological, psychological, and social factors throughout the lifespan. This bio-psychosocial approach has influenced several fields of study, including gerontology, personality development, identity formation, life cycle development, and more.
The Ages of Man are the historical stages of human existence according to Greek mythology and its subsequent Roman interpretation. Both Hesiod and Ovid offered accounts of the successive ages of humanity, which tend to progress from an original, long-gone age in which humans enjoyed a nearly divine existence to the current age of the writer, in ...
A newly developing human is typically referred to as an embryo until the ninth week after conception, when it is then referred to as a fetus. In other multicellular organisms, the word "embryo" can be used more broadly to any early developmental or life cycle stage prior to birth or hatching.