MCB 245 Lecture Notes - Lecture 3: Foam Cell, Myocyte, Dual-Energy X-Ray Absorptiometry

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Functions of the respiratory system: provides a means of gas exchange between the environment and the body, plays a role in the regulation of acid-base balance during exercise. Ventilation: the mechanical process of moving air into and out of the lungs. Respiration: process by which o2 moves out of lungs into the blood and co2 moves from blood into the lungs. Conducting zone: moves air through the trachea, bronchi, bronchioles, and terminal. Bronchioles to the respiratory zone (*no exchange of gases between blood and here) -humidifies, warms and filters air via mucus and macrophages. Respiratory zone: exchange of gases between air and blood occurs in alveoli of respiratory bronchioles and in alveolar sacs. Purpose of the different zones of the respiratory system. Inspiration: (active) lowering the diaphragm expands the volume of chest cavity, intrapulmonary pressure decreases. Creates vacuum for air flow in bronchiole passages. Expiration: (passive) diaphragm relaxes, elastic recoil of the alveoli raises the.

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