Fertilization Survival of species What is fertilization Fertilization

Fertilization Survival of species

What is fertilization Fertilization is the union of two gametes: an ovum and spermatozoon. This Photo by Unknown Author is licensed under CC BY-NC-SA

Ovulation For fertilization to happen, the female body first needs to produce an ovum

Fertile period • Women are not fertile (able to have a baby) all the time • An ovum can be fertilized only during a short window that starts a few days before ovulation and ends the day after ovulation.

Menstrual cycle • From the end of menstruation until ovulation, the endometrium thickens in anticipation of receiving a fertilized ovum. • If fertilization does not occur, the endometrium detaches from the uterus approximately two weeks after ovulation. • Endometrium = a lot of blood vessel • The blood exists through the vagina.

Menstrual cycle • In a 28 day cycle, menstruation usually last 5 days. • The ovulation always occurs 14 days before the first day of menstruation. • During ovulation, an ovum is released from the ovary. • An ovum can stay alive only for around 24 hours. • Spermatozoa can live for 3 to 5 days.

Spermatozoa and fertilization

Spermatozoa and fertilization

Spermatozoa and fertilization

Pregnancy is the time when a woman carries an embryo (then a fetus) in her uterus What is pregnancy

Zygotes and embryos

Zygotes and embryos

Fetus • After eight weeks of pregnancy, the embryo is called a fetus. It will keep this name until birth.

Fetus