Being Healthy

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Slide 1

Being Healthy

Breathing and the lungs

Slide 2

Objectives & Outcomes

Objective: Develop understanding of the structure of the lungs and gas exchange.

Outcomes:

All: Explain the process of breathing (4)

Most: Describe the difference between inhaled and exhaled air (5)

Some: Describe how alveoli are adapted for their purpose (6/7)

Extension: Describe how damaged alveoli can result in less gas exchange (7)

Slide 3

The Respiratory System

Gas exchange happens in the lungs.

You have 2 lungs, situated in your upper thorax / chest

Here, oxygen and carbon dioxide are exchanged – oxygen is needed for life and carbon dioxide is got rid of when we breathe out.

Slide 4

How do we breathe?

Mouth 

Windpipe/trachea 

bronchi 

bronchioles 

alveoli 

blood

Slide 5

Inhalation

(When we breathe in we inhale)

Slide 6

Exhalation

(When we breathe out we exhale)

Slide 7

Exchanging gases

Slide 8

The Alveoli

The outside of the alveoli is covered with tiny blood vessels.

Oxygen makes its way into thousands of special air sacs collectively called the ALVEOLI.

Slide 9

The Alveolus

One of these alveoli is called the ALVEOLUS.

This is where the oxygen is transferred into the blood and carbon dioxide moves out of the blood.

If all these alveoli flattened and spread out onto the floor, they would cover an area the size of a tennis court!

Slide 10

Comparing inhaled and exhaled air

What are the big differences between inhaled and exhaled air?

How could you test for these?

There is another difference……

…… water vapour.

Slide 11

Lets take a closer look (avi)

Slide 12

Backup of as wmv file

Slide 13