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LIFE BEFORE BIRTH (the sperm the smallest cell in human body, the egg the…
LIFE BEFORE BIRTH
the sperm the smallest cell in human body, the egg the largest cell in body
genetic code is stored in bundles called chromosomes 23 from each parent
about a day after fertilization, the egg makes its first division
the tiny ball now called a blastocyst
after 7 days, the blastocyst reaches the end of the fallopian tube and arrives in the uterus.
3 weeks
one of the first recognisable organs to form is the heart
4 weeks
the embryo is as big as a kidney and is growing by about 1mm everyday
with the heart now pumping, nutrients around the body and other organs begin to grow
8 weeks
the embryo looks more like a tiny human and becomes known as a fetus
the placenta is now matured
the placenta extracts everything the fetus needs from the mother's blood
the placenta also filters out many harmful substances
week 10
this first scan is also a chance to establish a more accurate due date
over 200 different types of cell have been made
an expert might guess the sex of the baby based on the angles looking at an ultrasound
12 weeks
the foetus enters the second trimester
still less than 10cm but having achieved his basic shape
16 weeks
the foetus begins to practice a wide range of movements
hands developed before the feet because hands are going to be used first once the baby is born
18 weeks
the eyes now in their correct position
24 weeks
it's time to put on some fat and learn how to work their bodies
strong flavors from the mother's food will easily pass through tha placenta into the baby's bloodstream and will then be passed out into the amniotic fluid
25 weeks
even eyelashes have grown
the foetus also can hear noises from the world outside
26 weeks
the foetus will swallow up to half a liter of amniotic fluid everyday
heart beats of foetus twice as fast as mother's
28 weeks
beginning to create memory
33 weeks
this stage babies spend about 90% of their time asleep
each minute, the foetus makes two and a half million nerve cells and now after 8 months, his brain is filled with more than a hundred billion neurons
38 weeks
the contractions are coming faster now every few heartbeats
when the lungs are mature, they secrete a protein into the amniotic fluid that alters the placentas production of hormones
it slows the release of progesterone and triggers the release of a new hormone oxytocin which kick-starts the contractions of the uterus
oxytoxin also inhibits memory and have role in helping women to forget the pain of birth
adrenaline also helps prepare the lungs for the lifetime of works.