Topics: Pregnancy, Embryo, Fetus Pages: 3 (804 words) Published: August 22, 2013
1) How is the baby’s due date calculated and why is it often hard to calculate? The baby’s due date is calculated by doctors and midwives from the beginning of the mother’s last period. This marker is used because it is difficult to determine exactly when the mother is ovulating and as a result when the sperm is fertilized the egg. 2) Briefly explain the process of conception?

Ovulation, Development of Corpus Luteum, Release of Egg, Menses, Fertilization, Implantation, Pregnancy Hormones. 3) What is DNA?
DNA, or deoxyribonucleic acid, is the hereditary material in humans and almost all other organisms. Nearly every cell in a person’s body has the same DNA. Most DNA is located in the cell nucleus but a small amount of DNA can also be found in the mitochondria. 4) How long is the germinal stage? Explain what happens in this stage. The germinal stage lasts only about 2 weeks. Within just a few hours after conception, the single-celled zygote begins making a journey down the fallopian tube to the uterus where it will begin the process of cell division and growth. 5) How can pregnancy be detected? What hormones play a significant role in this? You can detect pregnancy by certain symptoms. A pregnancy test can be detected. The hCG hormone plays a role in this. 6) Describe the physical development that occurs in relation to the ectoderm, mesoderm and endoderm.

7) What happens 18 days after conception?
The embryo commences growth inside the uterus. It is divided into three layers that will later form organs and tissues. The neural tube develops in the top layer. Some of these cells will further specialise, sprouting outward to cover the body with skin, hair and nails. The heart and the circulatory system begin to appear in the middle layer. The third layer starts to house the lungs, intestines and beginnings of the urinary system. In the meantime, the early division of the placenta, the chorionic villi, and the umbilical cord, which delivers...
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