Structure of the respiratory system.
- NASAL CAVITY
THE MECHANICS OF BREATHING.
- External intercostal muscles contract, causing the chest to move outwards and upwards.
- Diaphram contracts, causing it to flatten.
- The thorcacic cavity increases in size
- The pressure withing the lungs decrease.
- Breathing rate and depth increases
- Inspiration is aided by: sternocleidomastoid, pectoralis minor and scalenes.
- External intercostal muscle relaxes, causing the chest to move inwards and downwards
- The diaphram also relaxes, causing it to return to its dome shape
- The thoracic cavity decreases in size
- The lung pressure is now increased.
- Aided by the intercostal muscles contracting, causing the ribs to move inwards and downwards quicker.
- Also aided by the abdominal muscles.
LUNG VOLUMES AND CAPACITY.
- TIDAL VOLUME: The volume of air that can be inspired and…
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