Do Now: copy & complete

The alveoli are bunches of tiny air sacks inside the lungs.

Each individual sack is called an alveolus.

They are located at the end of the bronchioles.

When you breathe in, they fill with air.

The alveoli are covered in tiny blood vessels called capillaries.

The capillaries are very thin (one cell thick) so O2 and CO2 can pass through each alveolus into the blood stream.

Word list: capillaries blood bronchioles alveolus alveoli

Reminder: H/W research project due next Tuesday (Week 4)

- don’t leave it to the last minute!

Mark: Gas Exchange in the Alveoli worksheet

Clips: alveoli, Bill Nye…

Look at the info sheet on lung diseases:

1) Explain why asthma cause breathing difficulties – sketch the diagram to help your explanation

2) Explain why emphysema cause breathing difficulties – sketch the diagram to help your explanation

3) Explain why bronchitis results in a reduced rate of gas exchange in the lungs. 4) Explain why someone with a severe case of pneumonia may need extra oxygen.

How does smoking affect the lungs?Which picture shows the healthy lungs of a non-smoker and which show the unhealthy lungs of a smoker?

healthy lungs smoker’s lungs

Not a difficult question to answer but some people still think that smoking is cool!

How does smoking affect health?

Effects of smoking on health

bronchitis

liver cancer

osteoporosis

mouth, lip andthroat cancer

asthmalung cancerdental hygiene

problems

facial wrinkles

pancreatic cancer

impairedimmune system

heart disease

cervical cancer

kidney cancer

sperm abnormalities and impotence

bladder cancer

leukaemia

emphysema

stomach cancertesticular cancer

menstrualproblems

Asthma

Emphysema

• Caused by exposure to toxic chemicals or long-term exposure to tobacco smoke.

Emphysema