Time line of life

An egg cell is released from the ovaries, this is called ovulation.

Sperm cells are ejaculated from the penis.

Sperm cells “swim” up the vagina to the oviduct to meet the egg cell.

1 sperm and 1 egg cell fuse Fertilisation has occurred. The two cells then divide into four.

The group of cells keep dividing This ball of cells is called an The embryo implants into the lining

until it is a ball of cells. embryo. of the uterus.

The embryo is now attached to the uterus wall by a placenta.

At 6 weeks the embryo is now called foetus.

The foetus gets its nutrients via the umbilical cord.

The foetus continues to grow in the womb.

After 9 months (40 weeks) The mother goes into labour.

The waters break, the cervix dilates and the mother’s uterus contracts to

help push the baby out.

The mother will try to breast feed the baby to ensure it gets essential nutrients and antibodies.

At 12 months the baby becomes a toddler.

From 3 years old the toddler becomes a child.

Between the ages of 10 and 15 the child reaches puberty.

The chemical that control puberty are called the sex hormones.

In males puberty starts at about 11 years old.

In males the changes are:1. Voice deepening.

In males the changes are:2. Shoulders getting wider

In males the changes are:3. Testes and penis get larger and

begin to produce sperm.

Changes that occur in males and females are:Pubic hair and under arm hair

In females puberty starts at about 13 years old.

In females the changes are:1. Breasts develop

grows.

In females changes are:2. Ovaries start to release

eggs, and periods starts

In females changes are:3. The hips get wider.

A female has period every 28days

During the monthly cycle the lining of the uterus builds up.

During the monthly cycle an egg is released at about day 14.

At the end of the monthly cycle if the egg is not fertilised the lining of the

uterus breaks away, this is called menstruation.