Notes on the Respiratory System

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RESPIRATORY SYSTEM

RESPIRATION * Pulmonary ventilation * Moving air into + out of the lungs * External respiration- DOES NOT MEAN EXPIRATION OR EXHALATION * Gas exchange between the lungs + the blood (the aveoli and the blood) * Gas Transport * O2 + CO2 between the lungs + tissues * Internal respiration- internally! DOES NOT MEAN INHALATION OR INSPIRATION * Gas exchange between systemic blood vessels + tissues * (Additional functions: Smell, Speech)
CONDUCTING VS. RESPIRATORY ZONES * Conducting: Passages for air to flow through (everything except those structures that involve gas exchange, no exchange across the wall, just moves air in and out) * Cleanse, humidify and warm the air as it moves through these passages * Respiratory: Gas exchange function
NASAL CAVITY * High blood supply * Warms air * Mucous membran * Moistens air * Immunity (mucus, lysozyme, antibodies) * Pseudostratified ciliated epithelium (it moves things, like dirty mucous and mucous traps things so that you can either swallow it or blow it out of your nose) * Moves contaminated mucus toward throat * Hair * Filter air * Olfactory receptors * Smell * Contributes to speech sounds
PHARYNX
* Funnel-shaped tube that connects to the: * Nasal cavity and mouth superiorly * Larynx and esophagus inferiorly * Food and/or air passageway * Divided into 3 regions * Nasopharynx (next to the nasal cavity, ONLY EXPOSED TO AIR) * Air only: Pseudostratified ciliated columnar epithelium * Auditory tube (connected to middle ear, also called the pharyngotympanic tube which allows equalization of pressure on the outside and inside of the ear) * Tonsils (pharyngeal) – lymphatic tissue, the location allows for exposure to pathogens…...

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