What is the correct order from fertilization to birth?
The process of prenatal development occurs in three main stages. The first two weeks after conception are known as the germinal stage, the third through the eighth week is known as the embryonic period, and the time from the ninth week until birth is known as the fetal period.
What are the four stages of fertilization to birth?
The stages of fertilization can be divided into four processes: 1) sperm preparation, 2) sperm-egg recognition and binding, 3) sperm-egg fusion and 4) fusion of sperm and egg pronuclei and activation of the zygote.
How long does it take for childbirth to occur from fertilization to birth?
The total gestation period from fertilization to birth is about 38 weeks (birth usually occurring 40 weeks after the last menstrual period).
Which is the correct order of the stages of prenatal development?
There are three stages of prenatal development—germinal, embryonic, and fetal. Prenatal development is also organized into trimesters: the first trimester ends with the end of the embryonic stage, the second trimester ends at week 20, and the third trimester ends at birth.
How many sperm cells can fertilize an egg?
one sperm
How many sperm do you need to get pregnant? It takes just one sperm to fertilize a woman’s egg. Keep in mind, though, for each sperm that reaches the egg, there are millions that don’t.
What are the 3 major stages of prenatal development?
This union marks the beginning of the prenatal period, which in humans encompasses three distinct stages: (1) the pre-embryonic stage, the first two weeks of development, which is a period of cell division and initial differentiation (cell maturation), (2) the embryonic period, or period of organogenesis, which lasts …
Which is the first step in the fertilization process?
The first stage of human fertilization is the penetration of spermatozoa into the corona radiata of the egg, a coat made of cells that surrounds the egg. Sperm cells are able to go through this first barrier thanks to the release of the hyaluronidase enzyme, and the motion of their flagellum (the tail).
How long does it take a chimpanzee to get pregnant?
Learning Objectives. Pregnancy begins with the fertilization of an egg and continues through to the birth of the individual. The length of time of gestation varies among animals, but is very similar among the great apes: human gestation is 266 days, while chimpanzee gestation is 237 days, a gorilla’s is 257 days,…
Where does fertilization take place in the human body?
It is commonly believed that fertilization occurs in the uterus, but it actually does not. In particular, fertilization occurs in the Fallopian tubes, which are the oviducts that connect both ovaries (where egg cells are produced) with the uterus (where pregnancy develops).
When does the fetus move from conception to birth?
In the first four weeks from conception, fetal growth of the ovum begins with development of the spinal cord, nervous system, gastrointestinal system, heart and lungs. By eight weeks, in the embryonic stage, the face is forming, arms and legs move, the baby’s heart begins beating and the brain and other organs form.