Reproduction
For many years before a baby is conceived, the bodies of his parents have been getting ready for his conception. The mother's body has been producing egg cells (ova), and the father's sperm cells (spermatozoa) to fertilize them. Once an egg is fertilized, the baby needs a place to grow and develop; the mother's body has prepared such a place. When a girl reaches her teens her body begins to change, making it possible for her to produce and carry a baby. Her hips widen so that the pelvic cavity is large enough to hold a baby and allow it to pass through the birth canal. Her breasts enlarge so that after the baby is born, she can supply milk for him. Many changes are also going on insider her body. Each month one egg cell (ovum) is maturing and being released from one of her two ovaries. The ovaries are the storage place for undeveloped egg cells. An egg cell looks something like a hen's egg, except that it is the size of a pinpoint. It has a yellow center with a fluid around it. The outer covering or membrane is tough, but not as hard as a hen's egg shell. Each month the uterus, of womb, where the baby will grow, develops a special lining of blood vessels, which can nourish a baby. If an egg is not fertilized, it continues on it
Cells divide by a process called mitosis. All cells plant, animal, and human go through approximately this same procedure to reproduce. The chromosomes make copies of themselves and then gather in the center of the cell. In human tissue cells this would As they gather at each end, a nucleus membrane grows around each cluster. This separates them permanently, and they become two complete, identical cells. Originally the uterus was the size and shape of a pear, but its walls are made of muscle. Muscle can grow and expand, and that is exactly what happens to the uterine wall and is receiving nourishment from the mother through the placenta, the baby will begin to grow at a fantastic rate. Already much has been accomplished as the layers of cells begin their specialized development. The first sperm cell to reach the nucleus of the egg will live. All the rest will die in a few hours. When a girl reaches her teens her body begins to change, making it possible for her to produce and carry a baby. Her hips widen so that the pelvic cavity is large enough to hold a baby and allow it to pass through the birth canal. Her breasts enlarge so that after the baby is born, she can supply milk for him. Cells divide by a process called mitosis. All cells plant, animal, and human go through approximately this same procedure to reproduce. The chromosomes make copies of themselves and then gather in the center of the cell. In human tissue cells this would
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Approximate Word count = 3317
Approximate Pages = 13 (250 words per page double spaced)
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