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The beginning of human personhoodis the moment when a humanis first recognized as a person. There are differences of opinion about the precise time when human personhoodbegins and the nature of that status. The issue arises in a number of fields, including science, religion, philosophy, and law, and is most acute in debates about abortion, stem ...
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. In biological terms, the development of the human body entails growth from a one-celled ...
Elevated alpha-fetoprotein refers to a state where alpha-fetoprotein levels are outside of the reference range. There are two categories of AFP tests: tests performed on serum (blood plasma), and tests performed on amniotic fluid. Tests performed on serum are further categorized by the reason for performing the test: maternal serum, adult tumor ...
Fetal viability is the ability of a human fetus to survive outside the uterus. Viability depends upon factors such as birth weight, gestational age, and the availability of advanced medical care. In low-income countries, more than 90% of extremely preterm newborns (less than 28 weeks gestational age) die due to a lack of said medical care; in ...
Absence of embryo with heartbeat 7–10 days after a scan that showed a gestational sac with a yolk sac. [ 110 ][ 111 ] Absence of embryo at least 6 weeks after last menstrual period. [ 110 ][ 111 ] Amniotic sac seen adjacent to yolk sac, and with no visible embryo. [ 110 ][ 111 ] Yolk sac of more than 7 mm.
These are normal physiological adaptations that cause changes in behavior, the functioning of the heart, blood vessels, and blood, metabolism including increases in blood sugar levels, kidney function, posture, and breathing. During pregnancy numerous hormones and proteins are secreted that also have a broad range of effects.
Anatomical terminology. [ edit on Wikidata] 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. The resulting fusion of these two cells produces a ...
A fetus is a stage in the prenatal development of viviparous organisms. This stage lies between embryogenesis and birth. [ 1 ] Many vertebrates have fetal stages, ranging from most mammals to many fish. In addition, some invertebrates bear live young, including some species of onychophora [ 40 ] and many arthropods.