Psychology 2820E Lecture 10: Module 10 - Respiratory

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Respiratory: transport of oxygen from air into the blood, removal of carbon dioxide from the blood into the air, control of blood acidity (ph), temperature regulation, forming a line of defense to airborne particles. The lungs are located in the thoracic cavity and are surrounded by the rib cage and the diaphragm. The airways consist of the nasal cavity and the mouth, which join together at the pharynx. The pharynx leads into the larynx/voice box, which then becomes the trachea. The trachea divides into 2 main bronchi (left/right), which divide into smaller and smaller bronchioles. Bronchioles divide and eventually end in the alveoli, which are the sites of gas exchange. The pulmonary artery, which delivers deoxygenated blood to the lungs, branches to form a network of capillaries around each alveolus. The structure of the capillaries and blood flow characteristics maximize gas exchange. Characteristics: thin endothelial walls, large total cross sectional area, a very low blood velocity.

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