22 Respiratory System

22 Respiratory System - 22: Respiratory System 1....

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22: Respiratory System 1. Functions: a. Primary fxn is gas exchange: respiration b. Smell, protect from airborne pathogens, speech 2. 4 respiratory processes: a. Pulmonary Ventilation: i. Breathing, air moved in and out of the lungs so that gases in the sacs are continuously replaced b. Enternal Respiration: i. Gas exchange between blood and air at the alveoli. ii. Oxygen in sac diffuses into blood iii. CO2 in blood diffuses into sac c. Gas Transport: i. O2 and CO2 must be transported between lungs and cells of body ii. Accomplished in cardiovascular system, blood is carrier d. Internal Respiration: i. At systematic capillaries, gases must be exchanged between blood and tissue cells 3. Organized into 2 zones a. Conducting Zone: respiratory passageways that carry air to the sites of gas exchange i. Structures filter, humidify, warm incoming air ii. End in terminal bronchioles b. Respiratory Zone: actual site of gas exchange in the lungs i. Composed of terminal respiratory passageways that contain alveoli 1. Bronchioles, alveolar ducts, alveolar sacs 2. Starts at respiratory bronchioles 4. Nose a. Airway to respiration
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b. Moisten, warms, and filters air c. Resonating chamber for speech d. Nasal cavity lined with 2 types of mucous membrane i. Olfactory mucosa: houses olfactory (smell) receptors ii. Respiratory mucosa: most of nasal cavity 5.
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22 Respiratory System - 22: Respiratory System 1....

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