Lesson: Respiration

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Respiration

ENERGY

- The release of energy from food.

Aerobic respiration requires oxygen.

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Our digestive system breaks down food so it can be transported in the blood to all our cells.

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Our respiratory system supplies our cells with oxygen for respiration. This helps us to get energy from food.

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What are the products of aerobic respiration?

food+ oxygen =

+ water vapour

+ carbon dioxide

ENERGY

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How could we show the products of aerobic respiration?

Water vapour Woodlice + cobalt chloride paper

Carbon dioxide Woodlice + limewater

Energy Peas and a thermometer

Can you think of other ways to show these products?

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Equation for aerobic respiration

food + oxygen energy + carbon dioxide + water vapour

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Now, write down the equation for aerobic respiration.

food

oxygen

energy

carbon dioxide

water vapour

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We use our lungs to take oxygen into our bloodstream for respiration.

windpipe

lung

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We also use our lungs to excrete carbon dioxide.

windpipe

lung

bronchus

bronchiole

air sac

diaphragm

Use the diagram of the lungs in your textbook to locate these structures.

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Gas exchange occurs in tiny air sacs.

Oxygen Carbon dioxide

air sacs

When we breathe in, oxygen moves from air sacs into our bloodstream.

Carbon dioxide moves from our bloodstream into air sacs and is excreted out when we breathe out.

(into air)(from air)

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Smoking damages our lungs and slows down gas exchange.

Smoking causes:

Bronchitis

Lung cancer

Heart strain

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So say NO to cigarettes!

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Label each part.

Review Question.

AB

C

D

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Question to think about.

Is it a good idea

to smoke during pregnancy?