In this sub-unit we are going to explore the contents of:

Understandings:

  • Ventilation maintains concentration gradients of oxygen and carbon dioxide between air in alveoli and blood flowing in adjacent capillaries
  • Air is carried to the lungs in the trachea and bronchi and then to the alveoli in bronchioles
  • Type I pneumocytes are extremely thin alveolar cells that are adapted to carry out gas exchange
  • Type II pneumocytes secrete a solution containing surfactant that creates a moist surface inside the alveoli to prevent the sides of the alveolus adhering to each other by reducing surface tension

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