HIV is a virus that damages the immune system. The immune system helps the body fight off infections. Untreated HIV infects and kills CD4 cells, which are a type of immune cell called T cells. Over time, as HIV kills more CD4 cells, the body is more likely to get various types of infections and cancers.
This courses teaches about Ovulation and fertilization. Once every month or so, a woman’s ovary releases an egg cell. This process, known as ovulation, usually occurs about 14 days after the start of the woman’s last menstrual period, if they have a normal 28-day menstrual cycle. The egg cell is swept through the fallopian tube, which runs from the ovary to the uterus. The egg cell slows in the longest and widest part of the fallopian tube. This is where the egg cell is fertilized by a man’s sperm cell.
The reproductive system or genital system is a system of sex organs within an organism which work together for the purpose of sexual reproduction. Many non-living substances such as fluids, hormones, and pheromones are also important accessories to the reproductive system.