PATH 300 Lecture Notes - Lecture 16: Mucociliary Clearance, Cellular Respiration, Trachea
2 Apr 2018
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Document Summary
Airways are covered by a thin layer of mucus propelled by the cilia. Particles, pathogens, and foreign objects that are inhaled get trapped and coughed out or swallowed: engulfment (= phagocytosis) of foreign particles by macrophages. Structures of the respiratory system: the organization of the respiratory system can be divided in a few different ways, designate the upper and lower respiratory systems. The upper respiratory system includes the nose, the nasal cavity, the sinuses and the pharynx. The lower respiratory system includes the larynx, the trachea, the bronchi and the lungs. In an adult human, the lungs can weigh 900-1000g, of this weight 40-50% is blood. In humans, there are 3 lobes in the right lung and 2 lobes in the left lung: the trachea and the main bronchi are considered to be extra-pulmonary, because they are outside of the lungs. These main bronchi will divide again to form the secondary bronchi.
