Fertilisation and foetal development
Fertilitation:
During sexual intercourse the man's penis releases semen into the woman's vagina. Sperm cells travel in semen from the penis and into the top of the vagina. They enter the uterus through the cervix and travel to the egg tubes. If a sperm cell meets with an egg cell there, fertilisation can happen. Fertilisation happens when an egg cell meets with a sperm cell and joins with it.
The fertilised egg divides to form a ball of cells called an embryo. This attaches to the lining of the uterus and begins to develop into a foetus and finally a baby.
Pregnancy:
1º Term:2º Term:3º Term: |
Set for the equipment and the sexual organs.
The fetus grows and set for the face, hands and feet.The fetus is ready to quit the outside.
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The fetus it also needs its waste substances removing and is protected by the uterus and the amniotic fluid, a liquid contained in a bag called the amnion.
The placenta is responsible for providing oxygen and nutrients, and removing waste substances. It grows into the wall of the uterus and is joined to the foetus by the umbilical cord.
The placenta is responsible for providing oxygen and nutrients, and removing waste substances. It grows into the wall of the uterus and is joined to the foetus by the umbilical cord.