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The Respiratory System

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Your cells need oxygen

• To stay alive your cells need fuel and oxygen

• You get fuel from the food that you eat

• You get oxygen from the air that you breathe

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Why do we breathe?

• The respiratory system moves oxygen INTO your body and moves carbon dioxide OUT of your body

O2

O2

O2

CO2 CO2

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Structures of the Respiratory System

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Breathing

Diaphragm

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What is Asthma?

Normal Airway Asthmatic Airway

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Summary• Oxygen is necessary for life

• Oxygen in the air is taken into the body through your lungs when you breathe in

• Oxygen goes from the lungs into the blood and is carried to the cells throughout the body

• Cells use oxygen to make energy from food

• Waste (carbon dioxide) from the cells is carried back to the lungs by the blood

• Carbon dioxide leaves the body when you breathe out