7 b reproduction


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Human Reproduction

Humans use sexual reproduction to produce their young.

In order to do this the two parents have to have sex organs so that they can produce sex cells.

In humans, males and females have different reproductive systems and sex organs

Go to the activity on the next page to see how much you know.


The next slide shows the names of eight different parts of the male and female human reproductive systems.

Drag a name to the correct column depending on whether you think that this is part of the male system or part of the female system.

Male or Female


Male or Female


The Male Reproductive System


The Female Reproductive System


Reproductive System


Sex cells - Sperm

In males the sex cells are called sperm.

Sperm are produced in sex organs called testes.


Sex cells - Eggs

In females the sex cells are called eggs.

Eggs are produced in sex organs called ovaries.

Nucleus containing

chromosomes

cytoplasm

membranejelly coat

An egg is so big that this is how big a sperm looks next to it.


Sperm or Egg?

Both sperm and eggs have special features that makes it possible for them to carry out their jobs.

Look at the statements on the next page and decide which one you think belongs to an egg and which one belongs to a sperm. Once you think you know push the buttons to see if you are right.


Sperm or Egg?


Ovulation and Fertilisation

In the female one of the ovaries produces an egg every 28 days. This is called ovulation.

During sexual intercourse sperm is ejaculated into the vagina.

If the sperm and egg meet the sperms nucleus will join with the eggs nucleus. This is called fertilisation.


Fertilisation and Implantation


Word Check


The Placenta

It forms a plate-like structure called the placenta.The umbilical cord joins the fetus to the placenta.In the placenta food and oxygen diffuse from the mothers blood into the blood of the fetus. Carbon dioxide and waste products diffuse from the blood of the fetus to the mothers blood.

How does the embryo get food and oxygen and how does it get rid of waste?


The Placenta


The Embryo


Embryo Development


Embryo Development

In one of these images the developing baby is called an embryo.

Which one is it?

What name is given to the other five developing babies?


Birth


Puberty

Human children are born with a complete set of sex organs. However they do not become active until later in life.

Between 10 and 18 the testes start to make sperm and the ovaries start to make eggs.

This time of development in their life is called PUBERTY.

As well as these changes other changes may also occur.


Puberty in Girls


Puberty in Boys


One change that happens to girls at puberty is that they start to undergo a monthly cycle called the menstrual cycle.

This cycle is a process where the uterus lining builds up to receive a fertilised egg.

If an egg is not fertilised then the lining of the uterus breaks down and is lost from the body. This is called menstruation or a period.

Menstruation


The Menstrual Cycle

7 b reproduction

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