BIOL 1010 Study Guide - Final Guide: Hypothalamus, Control Of Ventilation, Ventral Respiratory Group

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Nasal cavity: warm and clean the air & air gets humidified. Pharynx: space in back of throat (food saliva) esophagus (posterior to the larynx) Inflammation of the airways causes airflow to be restricted. Muscles of bronchial tree become tight and swell, smooth muscles constrict wheezing. Surfactant producing cells (type ii) aka cento cells. Produce a secretions that is known as surfactant (a mixture of liquids and proteins; phospholipids and protein) Surfactant reduces the surface tension in the alveoli. It prevents alveoli from closing in on themselves. It disrupts some of the hydrogen bonding in the water and that contributes to the walls of the alveoli to stay separated from each other. Especially important in exhaling when the pressure can result in the collapse of the lungs. Surfactant is produced before birth (about a month or so before a baby is born)

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