BPK 142 Lecture Notes - Lecture 7: Bronchiole, Bronchus, Trachea

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Pulmonary structure and function: anatomy of the respiratory system. Respiratory system consists of nose, pharynx, larynx, trachea, bronchi, and lungs. With branching, supportive cartilage is gradually replaced by smooth muscle: Contraction and relaxation of this smooth muscle constricts or dilates the bronchioles: major effects on airway resistance. The conducting airways lead inspired air to the alveoli. Volume of conducting airways = anatomic dead space (vd) - 150 ml. Alveoli - small, thin walled sacs that have capillary beds in their walls site of gas molecule (o2 & co2) exchange between air and blood there are millions (300) of alveoli. Respiratory membrane alveolar-capillary membranes that separate the air molecules in the alveoli from the blood in the capillaries - average thickness is 0. 6 micrometers. The respiratory membrane has a very large surface area 70 square meters in the normal adult. Lungs - contain conducting airways, alveoli, blood vessels, elastic tissue.

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