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Describe the mechanism of gaseous exchange in a mammal.
Answer
1. Breathing In:
- External intercostal muscles contract and internal intercostal muscles relax lifting/raising the ribcage upwards and outwards. Muscles of diaphragm contract hence it flattens. The volume of the thoracic cavity/lungs increases while the pressure decreases. Higher air pressure in the atmosphere forces air into the lungs( through nose)
2. Breathing Out:
- External intercostal muscles relax while internal intercostal muscles contract moving the rib cage downwards and inwards. The muscles of diaphragm assumes dome shape. The volume of thoracic cavity decreases while pressure increases. High pressure forcing air out of the lungs(through nose)
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