Learning Objectives:

1.To be able to describe the structure of the lungs

2.To explain how the lungs clean themselves

3.To be able to explain gaseous exchange

Starter Questions

1.What gas do we breathe in?

2.What gas do we breathe out?

3.What protects our lungs?

TASK: Design a leaflet to inform people how they can damage their lungs - e.g.

•Smoking•Working in dusty environments etc

Include:

•What is damaging them•The effects it has on the lungs•What the consequences may be as a result of these

Lungs are the organs of respiration.

The process of oxygen and carbon dioxide moving between the lungs and the blood.

Trachea

Lung

Diaphragm

Ribs

Alveoli

Intercostal Muscles

Bronchi

Bronchioles

Draw and label the diagram of the lung in your book!

This means that the rib cage must also be able to change position.

OBSERVATIONOBSERVATION

Take your hands and place them flat on your chest just above your hips on each side of your body. Now breathe in and

out very deeply. Whilst you do this, watch to see what happens to your

hands.

You should notice the following things…..What do you notice?

When you breathe in (inhale), your hands move upup and outwardsoutwards.

When you breathe out (exhale), your hands move downdown and inwards.inwards.

Let’s see why…. InhalingInhaling

When we inhale, our lungs fill with air.

As they fill, they become enlarged.

The ribs must then move upwards and outwards to make more room in the thorax.

The overall effect of this is that our chest expands.

Inhalation(When we breathe in we inhale)

Exhalation

(When we breathe out we exhale)

• As you breath in, your chest moves u________ and o_______

• As you breath out, your chest moves d________ and i________

Breathing in is called inhaling and breathing out is called ________.

Learning Objectives:

1.To be able to describe the structure of the lungs

2.To explain how the lungs clean themselves

3.To be able to explain gaseous exchange

Surface of bronchioles is made of 2 types of cell

Goblet cells make mucus. If microbes get in they stick to it.

Ciliated cells have tiny hairs called cilia. They sweep the mucus out of your lungs to your throat.

Smoking stops the cilia from working, so you have to cough

to get rid of mucus.

Explain the two ways in which the lungs are kept clean!

Also answer Questions 4-6 pages:20

Learning Objectives:

1.To be able to describe the structure of the lungs

2.To explain how the lungs clean themselves

3.To be able to explain gaseous exchange

Down the windpipe

Through each bronchus

And through all the bronchioles within

each lung

BUT WHAT HAPPENS NEXT?

Always remember

that the CO2

is moving in the opposite

direction!

Oxygen will pass

The alveoli are adapted to make gas exchange in lungs happen easily and efficiently.

Features of the alveoli that allow gas exchange:

They have moist, thin walls (just one cell thick)

They give the lungs a really big surface area

They have a lot of tiny blood vessels called capillaries.

http://www.bbc.co.uk/schools/ks3bitesize/science/organisms_behaviour_health/life_processes/revise5.shtml

How the Alveoli works

The gases move by diffusion.

Diffusion is the process by where gases move from a high concentration to a low concentration:

Oxygen diffuses from the air in the alveoli into the blood.

Carbon dioxide diffuses from the blood into the air in the alveoli.

Capillary

Draw a picture of the alveoli from page 19 in your book.

Answer question: 8.

What’s the difference?