Why do we need to reproduce?

What would happen if we did not?

Humans reproduce by sexual reproduction? What is another type of reproduction?

Stages of our live

What are the sexual characteristics?

How can they be?

Examples of secondary sexual differences.

What is the puberty?

How does it happen?

When does it happen?

The female reproductive system ...

Parts or female reproductive system.

The female reproductive system with labels ...

Puberty in girls

The menstrual cycle

What is the menstruation?

The menstrual cycle (image)

When do women stop menstruating?

What role does the brain play during puberty?

What secondary changes occur in girls during the puberty?

Explain what happens to an ovum if it not fertilised.

What happens when a woman has no ova left?

The male reproductive system ...

Parts of the male reproductive system ...

The male reproductive system with labels

The semen

Puberty changes in boys.

Genes

Which part of the body secretes testosterone? What does testosterona do?

What changes do boys experience during puberty?

How are male and female sex cells different?

What two functions does the penis have?

Write the words in the correct order from the production of sperm to ejaculation.

Sexual reproduction in humans

1. Fertilisation ...

How many sperm are needed for fertilisation to ocurr?

The zygote (two weeks) ...

2. Development of the embryo (from 3 to 8 weeks)

3. Development of the foetus (from 9 weeks until the end of pregnancy)

What protects the foetus during prenancy?

How does the foetus receive oxygen and nutrients during pregnancy?

What is the umbilical cord?

4. Birth

Stages of birth ...

What is the pregnancy?