CFD 135 Chapter Notes - Chapter 10: Conceptus, Oligospermia, Episiotomy
Document Summary
Crude birth rate- the number of children born per 1000 women per year. Fertility rate- avg number of live births per women, in a given population, per year. Replacement level- a fertility rate of 2. 1. 2004: birthrates for teens reached a historic low. Decrease is across all groups with rate of pregnancy among teens decreasing by. 1. 5 million unmarried women gave birth in 2004. Of all births in us 35. 7% were to unmarried women in 2004. 25-29 year olds birth rate was highest of any group. Women in their 20s are in peak of child. Reflects the cultural trend of delaying childbearing to establish careers. During intercourse, millions of sperm are ejaculated into the vagina. When sperm reach the ovum, they connect to its outer layer. Capacitation occurs, allowing the sperm to penetrate the egg. The outer layer of the egg hardens and makes it impossible for the sperm to escape. Begins with the fusion of sperm and egg.
