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oscar pena

on 1 May 2013

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Transcript of Biology

Development Before and After Birth Fertilization Between 300 and 500 million sperms enter the vagina, but some are destroyed by the acidic fluid.

The remaining sperm pass into the 2 oviducts, where the egg is present in one of them. Once a sperm enters the egg, no more sperm can enter.

Both nucleus combine to form a zygote. Implantation Next 6 days zygote passes into the uterus. Cell division produces a hallow ball of cells called Blastocysts. Blastocysts attaches to the uterine which is called implantation. Umbilical cord forms which attaches to the uterus. Chorionic villi starts to grow which combined with uterine lining to form the placenta, where both nutrients and waste enter and leave by. Pregnancy last about 280 days, but the baby only develops for about 266 days, which is divided into 3 trimesters. First Trimester All the organ systems of the embryo begin to form, and in 8 weeks all of the organs have been formed.

The embryo is now referred to as a fetus. At the end of this first trimester, the fetus weighs about
28g and is about 7.5 cm long. Second Trimester Next 4 months is limited to body growth, but slows down at the beginning of the 5th month. At 5 months, fetal movement is felt by the mother. At 6 months, the eyes open and the eyelashes form. The fetus now weighs about 650 g and is about 34 cm long. Third Trimester The mass of the fetus more than triples. The fetus also continues to kick, stretch, and move. By the 8th month, fat is deposited beneath the skin to help insulate the new born. By the end of this trimester, the fetus now weighs about 3,330 g and is about 51 cm long. Birth The process by which the fetus is pushed out of the uterus is called Birth.
Birth occurs in 3 recognizable stages: Dilation, Expulsion, and the Placenta stage. Dilation Stage Dilation begin with a series of mild contractions, the contractions begin to occur until the cervix is wide enough to allow passage for the baby.
When the cervix is about 10cm, it is fully dilated. Expulsion Stage Expulsion occur when the involuntary uterine contractions become so forceful that they push the baby through the cervix, into birth canal, and out the mother's body. Placental Stage 10-15 minutes after the birth of the baby, the placenta separates from the uterine wall and also with the remains of the embryonic membrane.
uterine muscles contract forcefully to prevent the mother from bleeding excessively.
After the baby is born the umbilical cord is clamped, and cut near the baby's abdomen Infancy First two years of live is known as infancy.
During infancy the child shows tremendous growth, and an increase in physical mental development.
The child weight triples in a year, and by 2 years their 4 times their birth weight. As infants they learned to control its limbs, roll over, crawl, and walk.
By the end of infancy, the child also utters his or hers first words. Child to Adult As adolescence, puberty begins.
Physically, the childhood are a period of steady growth.
Mentally, a child develops the ability to reason and to solve problems. In adolescence growth spurt occur.
During teen years, adolescents reach their maximum physical stature.
As a young person reaches adulthood, his or hers organs have reach maximum mass, and physical growth is complete Adult Ages As adults, our body undergoes many distinctive changes.
Metabolism and digestion become slower. The skin loses some of its elasticity, and less pigment is produce in the hair follicles, causing the hair to turn white. Bones become thinner and more brittle. Vision and hearing might diminish, but many people continue to be both intellectually and physically active as they grow older. http://krames.sjmctx.com/HealthSheets/3,S,88740 http://science.howstuffworks.com/life/human-biology/pregnancy4.htm
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