Mechanisms of Breathing (2)

Biology

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Actions that cause the volume and pressure of the thoracic cavity to increase and decrease respectively during inhalation

The ribcage moves upwards and outwards, the diaphragm moves downwards to become flat. These actions force the air from outside to flow into the lungs

Actions that cause the volume and pressure of thoracic cavity to decrease and increase respectively during exhalation

The ribcage moves downwards and inwards, the diaphragm moves upwards and becomes a dome. These actions pushes the air out of the lungs

Similarities between breathing mechanisms in humans and animals (1)

Humans and animals have special muscular structures to expand and contract the respiratory cavity

Similarities between breathing mechanisms in humans and animals (2)

The breathing mechanism involves changes in the volume and pressure in the respiratory cavity

Respiratory structure of insects

Spiracle

Respiratory structure of fish

Mouth and operculum

Respiratory structure of frogs

Nostrils

Respiratory structure of human

Nostrils

Structure that helps breathing in insects

Thorax, abdomen

Structure that helps breathing in fish

Operculum and muscular floor of buccal cavity

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