BIOL 003 Lecture Notes - Lecture 20: Thoracic Cavity, Nasal Cavity, Pleural Cavity
Document Summary
Humidifies and warms air to match body temp for effective gas exchange. Regulates airflow slowing down to be filtered in nasal cavity. Connects mouth & nasal cavity to oesophagus and larynx. Lungs and tubing (e. g. trachea, bronchi, bronchioles, alveoli) Trachea c-shaped cartilage keeps tubing open. Site of external respiration (gas exchange between air and blood) High sa maximises external respiration rate. Surfactant secreting cells on alveolar lining - surfactant moistens and separates alveoli membranes. Macrophage protects from any foreign particles eats" and destroys pathogens. Connective tissue surrounding lungs and inside of thoracic cavity. Parietal pleura covers internal surface of thoracic cavity. Pleural cavity space between visceral & parietal pleura, contains thin film of liquid. Holds pleura together by surface tension if one moves, so does the other if thoracic cavity moves, so does the lungs! The need to breathe is regulated by the pco2 in your lungs.