Zygote:-
single cell resulting from the fusion of a sperm nucleus with the nucleus of secondary
oocyte at fertilisation; zygote usually forms in oviduct.
Morula:-
Solid ball of about 16 cells called blastomeres,produced through cleavages of
the zygote.
Blastocyte:-Ball
of cells with surface layer and an inner cell mass. produced after the morula
enters the uterus then , fluid enters the ball and lifts some cells to form a
cavity.
Embryo:-
Embryo refers to all development stage from two
weeks after fertilisation unit the end of the
8th week. all major body structures begin forming during the embryonic period.
Foetus:-Foetus
refers to all developmental stages from the 19th
week until birth, about 38th week after
fertilisataion. The rate of overall
growth and structure elaborations increase dramatically during the foetal
period.
Newborn:-Baby
from0-28 days in called neonate, which can be
divided in
to early neonate. The physiological transition
from life in the uterus to life in the external world requires many gradual changes,
as in respiration.
Infant:-
Individual from 4 week to 1 year after birth. During infancy, Body weight
triples and height doubles, on the average.
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