Respiratory System (1)

Science

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Breathing

Process of inhaling and exhaling air by the lungs

Human respiratory system

The system in the body that helps us to breathe

Function of human respiratory system

To supply oxygen and removes carbon dioxide from the body cells

Direction of air in breathing mechanism

Intercostal muscles during inhalation

Contract and pull the rib cage upwards and outwards

Diaphragm muscles during inhalation

Contract and pull the diaphragm to descend and flat

Intercostal muscles during exhalation

Relax and the rib cage moves downwards and inwards

Diaphragm muscles during exhalation

Relax and curve upwards

The air pressure during inhalation

The higher air pressure outside forces air to enter the lungs

The air pressure during exhalation

The higher air pressure in the lungs pushes the air out

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