Strep throat is a contagious disease caused by infection with streptococcal bacteria, which causes inflammation and swelling of the mucous membranes lining the back of the throat and the tonsils.trep throat is a contagious disease caused by infection with streptococcal bacteria, which causes inflammation and swelling of the mucous membranes lining the back of the throat and the tonsils.
Once an egg cell is fertilized by a sperm, it will divide and become an embryo. In the embryo, there are stem cells that are capable of becoming all of the various cell types of the human body. For research, scientists get embryos in two ways. Many couples conceive by the process of in vitro fertilization. In this process, a couple's sperm and eggs are fertilized in a culture dish.
It remains in the ampulla portion of the tube (in average during 18-24 hours). Healthy sperm usually âwaitâ in fallopian tube for healthy egg (in average 48 hours). One sperm penetrates the zona pellucida (egg). If fertilization does not occur, the ovum disintegrates and is destroyed by the tube.Implantation. After fertilization occurs, the ovum remains in the fallopian tube for about 72 hours.ERTILIZATION. Fertilization occurs when a live sperm penetrates the newly released mature egg successfully and cell division starts. The woman has now conceived â the embryo is growing! During sexual intercourse, millions of sperm are released into the vagina and move through cervix to uterus and fallopian tubes.