Breathing and Gas Exchanges

Thèmes abordés

Breathing and Gas Exchanges, Air passage

Résumé du document

Structure of the gas of the exchange system
Lungs enclosed in the thorax by the ribcage and the diaphragm (muscular sheet of tissue)
Joining each rib to the next = intercostals muscles

Air passage is highly branching network: called bronchial tree
Air enters our nose/ mouths, passes down the trachea, trachea splits into two tubes called the bronchi leading to each lung. Then bronchus divides into smaller tubers: bronchioles, ending at microscopic air sacs, the alveoli (gas exchange with blood).

Wall of trachea and bronchi contain rings of cartilage: support the airways, keep them open
Thorax separated from the lungs by 2 moist membranes, the pleural membranes (between them: the pleural cavity fill with pleural fluid => lubricate so lungs don't stick to the chest)

In large airways: cells clean by secreting mucus
Other cells cover with cilia: beat backward/forwards sweeping the mucus and trapped particles out towards the mouth

Extraits

[...] Wall of trachea and bronchi contain rings of cartilage: support the airways, keep them open Thorax separated from the lungs by 2 moist membranes, the pleural membranes (between them: the pleural cavity fill with pleural fluid lubricate so lungs don't stick to the chest) In large airways: cells clean by secreting mucus Other cells cover with cilia: beat backward/forwards sweeping the mucus and trapped particles out towards the mouth Ventilation of the lungs Move of air in/out of the lung The air moves from a place with high pressure to one which is low Inhalation: The external intercostals muscles contract and pull the ribs up. [...]

[...] Chapter Breathing and Gas Exchanges To respire aerobically, cells need continuous supply of oxygen from the blood and co2 needs to be removed those exchanges btw the blood and the air in the lungs Respiration oxidation reaction that releases energy from food Ventilation, or breathing mechanism that moves air in/out of the lung Structure of the gas of the exchange system Lungs enclosed in the thorax by the ribcage and the diaphragm (muscular sheet of tissue) Joining each rib to the next = intercostals muscles Air passage is highly branching network: called bronchial tree Air enters our nose/ mouths, passes down the trachea, trachea splits into two tubes called the bronchi leading to each lung. Then bronchus divides into smaller tubers: bronchioles, ending at microscopic air sacs, the alveoli (gas exchange with blood). [...]

[...] Thus blood carries less oxygen. [...]