Now i want to discuss about science of human development .
A fetus develops in the womb. it takes the 40 weeks of journey from a cell to be a baby to be born.
These cells, are the building blocks of out bodies. they make us to build by the hundred thousand thousand billion cells . inside in our body every cells is the extraordinary engine. the machine that provide the each cells how to grow and provide the function . the chemicals creates the each life and the new born person of the baby ready to journey into the world. the baby have 2 choice than for start of this journey , breath or die .
Just after the birth lungs have never breathed before because they filled with amniotic fluid so the new born is in danger before journey . the adrenal gland send adrenaline for searching around the body and after than it shocks the lungs into life. we take our first breath. its all because the air sacks pull oxygen into our blood and pump out the co2. after birth it changes everything. the physical length between mother and child is broken.
The heart is working normally by blood vessels. the digestive tract id ready to clear by its own to make space for the baby's first meal. . one more important to know , in the womb the fetus is in 100 degree F but in home 65 degree F. the brain control the temperature and send out instruction for our cells and provide energy. its hypothalamus . the brain is under pressure for keeping our body in normal functioning.
from the first journey the baby needs milk and the journey is starting by sucking the breast milk of mother. mothers milk is like the super food for baby . it will be the close contact between mother and baby.
Mothers milk contain antibody and have a better digestive for baby. it will growth the baby's senses and development of brain. the nose is working every time by signal of smell. the nerves are super sensitive .the baby are developed in undeveloped eye vision . after passing the 1 months the world is blurred because the immature eye muscle . our immature brain haven't learned to interrupt with the data yes. at two months the baby identify the color , at four months he identify the mother face. by eight months we have 20/20 vision.
His first teeth , milk teeth from deep in our gums , it coming through. one by one they coming through. at eight months of the baby of every sensation is new surprise. after passing time the baby can take liquid to solid food. he swallow the food , enters into stomach then coils of small intestine and then large intestine . by contracting muscle keeps the food moving. its all because of the peristalsis.
During the growth of body different particulars virus causes a rush such as chicken pox. now i want to tell you about the mechanism of chicken pox. the immune system kicks into action . BBC attach with the infected cells. pumps poisonous protein and kill the cell and virus. each one contains the cellular debris and a lot viruses. but our body creates antibody against this virus. but in case of older human if the same virus attack us , the anti body recognize it.
that's why in childhood everyone should have the perfect time for vaccinations.
Now the most important to know about puberty . it changes the biggest change of them . It depends on our D.N.A . puberty starts when the hypothalamus release protein . sex organ begin to mature. in case girls it means ovulation. during ovulation the egg burst from the ovary . then it goes to the Fallopian tube to the uterus. it occurs in every month.
By releasing different hormones especially estrogen progesterone in case of female and testosterone in case of male , changes the body shape and provide more growth. so that girls become women and boys become men. men produce sperm by stimulating testicular hormone. in case of male hormone , testosterone have many more function such as muscle growth , hair development , vocal cord wide , increasing hormone activity and blood cell produce more etc.
Trillions of our cells make up our organs and tissues, new cells grow and divide to replace the old ones. our body replaces entire organ. after passing every 10 years we getting into the new body. tissues are regenerate faster like hair , nail . they grow by their modified cells. by day by day our body regenerate many more system but we have our choice in sometime for our lives , JUST LIKE EXERCISE . by exercise muscle growth occurs . the muscles are getting bigger and stronger . another example in our choice to live is smoking, alcohol consumption . they effects our organ , liver damage, increasing blood pressure and having chemical reaction into brain. the more we drink the extremely effects .
eventually we all getting marriage . after marriage it changes the world to us because of new emotions , happiness , responsibility to take care of family etc .provide a long turn bonding . SEX made by his or her partner. its the most important thing to make a baby . i am sharing a video to understand clearly about it.
20 millions of sperm enters into the vagina to cervix. only one sperm fertilization takes place into ovum. Implantation takes place into the uterus. half the man and half the woman chromosome combine and creates a unique DNA code, which is need to create a life. these combine chromosome from the first cell of the new baby. this is now called zygotes.
