Assignment : Stages Of Development

1780 Words Nov 14th, 2014 8 Pages
"LP10 Assignment: Stages of Development."

For this assignment, I will use the websites, lab and materials from this week and complete an internet search of my own on development. I will write a two- page essay that describes the following: the hormonal and other changes in the maternal body during pregnancy, how the primary germ layers originate, the major events that occur during the fetal stage of development and the stages of development of a human life and the general characteristics of each stage.

Development

Development is the continuous process by which an individual changes from one life phase to the next. These life phases include a prenatal period that begins with the fertilization of an egg cell and ends at birth and a postnatal period that begins at birth and ends with death. The presence of a developing offspring in the uterus is called pregnancy. Pregnancy consists of three periods called trimesters and each is about three months long. The prenatal period that develops the offspring usually lasts for about thirty-eight weeks from time of conception. It can be divided into a period of cleavage, embryonic stage and a fetal stage.

Hormonal Changes During Pregnancy

The corpus luteum degenerates about two weeks after ovulation in a typical reproductive cycle. Accordingly, concentrations of estrogens and progesterone decline rapidly and the uterine lining breaks down so the endometrium sloughs off as menstrual flow. If this happens the following…
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