5 senses

THE BODY SYSTEMS

THE CIRCULATORY SYSTEM

How do we relate to what is around us?

we are able to relate to what is around us through our senses.

This means that we can recognise and respond to changes.

The nervous system receives information from the senses and chooses the best response.

The nervous system controls everything that happens in our bodies. It is made up of:

THE 5 SENSES

The ears are organs of hearing.

We use our ears to hear the sounds. The ear has three parts

The middle ear:

• The ear drum.
• Three little bones: The hammer, the anvil, and the stirrup.

The eyes are the organs of sight. We use our eyes to identify colour, shape, size and distance. The eyes has different parts:

The iris is the coloured circle in the middle of the eye.

The pupil is the black hole in the middle of the iris

The lens

The nose is the organ of smell.

We use our noses to identify different smells.

Olfactory nerve

Nerve endings

The smell goes into the nose through the nostrils .

Inside the nostrils there are small hairs and mucus to stop dust from going in.

The smell is picked up bu nerve endings connected to the olfactory nerve which carries the message to the brain.

The organ of taste is the tongue. The tongue is inside the mouth. We use our tongue to identify different flavours.

Taste buds

All over the tongue are taste buds. These are nerve endings. They pick up different flavours. The four basic flavours are: Sweet, sour, salty and bitter.

The taste buds are connected to the taste nerves. They carry messages to the brain.

The skin is the organ of touch. We use our skin to identify if something is hot or cold, soft or hard, smooth or rough.

Our body is covered in skin. Every part of our skin has nerve endings that pick up information. These nerves carry messages to the brain.

In some parts of our skin we have more nerve endings. These are the most sensitive parts, like the palms of our hands or the soles of our feet.

Our body is a very complex machine. It has a lot of parts that works together. The most important parts are called Organs and they form the different Body systems.

What does our nervous system do?

How does our nervous system work?

Look for

warm clothes

We carry the messages from and to the brain

There are nerves all over our body.

They can carry messages to and from the brain and the rest of the body.

The sense organs receive information.

I am cold

The brain is inside the skull. It is the organ that receives and responds to information about what is happening inside and outside our body.

Well done!

The locomotor system allows us to move

The spinal cord

http://www.childrensuniversity.manchester.ac.uk/interactives/science/brainandsenses/connections/

We have five senses:

The inner ear:

• The cochlea.
• The auditory nerve

The outer ear:

• The ear.
• The outer ear canal: has small hairs and wax. They stop dust from going in.

A sound goes into the ear, down the outer ear canal and makes the ear drum vibrate.

The vibrations go to the small bones of the middle ear. These pass the vibrations on the cochlea in the inner ear. The cochlea is connected to the auditory nerve.

The auditory nerve carries the message to the brain.

Nostrils

The retina

The optic nerve

The Cornea

We see an object because light bounces off it.

The light goes into the eye through the pupil. The lens focuses the light and makes an image of the object on the retina. This is like the screen at the back of the eye. The retina is connected to the optic nerve and this carries the message to the brain. If there is no light, we cannot see!