Lungs

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Slide 1

Lungs

By the end of the lesson you should be able to:

Label the internal structures of the lungs

State the features of the alveoli which allow efficient gas exchange

Explain the role of diffusion in gas exchange

State the features of the capillary network that allow efficient gas exchange

Slide 2

Breathing

footprints breathing

Slide 3

The lungs

organs that allow gas exchange

oxygen in / CO2 out

trachea

- has rings of cartilage

bronchi (bronchus)

bronchioles

alveoli (alveolus)

computer animation

Slide 4

Alveoli (air sacs)

provide large surface area for gas exchange

one lung equivalent to a tennis court of surface area using alveoli

footprints alveoli

Slide 5

air sac in lungs

deoxygenated blood

oxygenated blood

body cells

air in

air out

skool gas exchange

Slide 6

Features of Alveoli for efficient gas exchange

large surface area to absorb oxygen.

moist surface to allow oxygen to dissolve.

thin lining to allow easy diffusion of gases.

dense network of blood capillaries for easy gas exchange.

skool adaptation of alveoli

Slide 7

Features of capillaries for efficient gas exchange

dense network to carry CO2 and O2

Large surface area to transport gases

Lining is one cell thick so gases can pass through quickly and easily.

Slide 8

Lungs

Can you?

Label the internal structures of the lungs

State the features of the alveoli which allow efficient gas exchange

Explain the role of diffusion in gas exchange

State the features of the capillary network that allow efficient gas exchange