respiratory - Respiratory system The link between the...

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Respiratory system The link between the oxygen outside your body, and the cells inside your body… gas exchange (O2 and CO2). - ventilation: moves air to and from exchange surfaces - external respiration: provides an area for gas exchange - transport: moves gases into and out of the body (hemoglobin) - internal respiration: exchange of gases between blood and tissues Respiratory tract also: - produces sounds (speaking, singing etc) - provides olfaction divided into upper respiratory system (nose, nasal cavity, paranasal sinuses, pharynx) and lower respiratory system (larynx, trachea, bronchi, bronchioles, and alveoli) the conducting tract (carries air in – nasal cavity, pharynx, larynx, trachea, bronchi, bronchioles, terminal bronchioles) warms, filters and humidifies air as it comes in… removes particles and pathogens before it reaches the alveoli… basically ventilation. The respiratory surfaces (bronchioles and alveoli, where gas exchange/external respiration occurs) are overall very large… 35x the total area of the body surface! Respiratory defense system: filtration mechanisms that protect the tract. - goblet cells produce mucus that traps debris and microorganisms – cilia sweep them back out (mucociliary escalator) - filtration in nasal cavity removes particles greater than 10 μ m - smaller particles are trapped in mucus covering bronchioles or in alveolar fluids Respiratory tract: nose and nasal cavity. Air enters through nostrils, which open into nasal cavity. Hairs trap large particles. Olfactory region lined by olfactory epithelium, which conduct information about smell When you breathe in the air is dry, so breathing in through your nose will help to keep it wet and warm – moistened in nasal cavity. pharynx. Chamber behind nasal cavity shared by digestive and respiratory systems. larynx. Cartilage structure that surrounds and protects glottis, narrow opening that conveys air. Epiglottis – covers the larynx during swallowing to keep food from going down the respiratory tract. Vocal cords – cover entrance to glottis - produce sound. Voluntary muscles control the length of the cords, so this will alter the pitch of the sound. trachea and primary bronchi. Trachea – windpipe – flexible tube that carries air from larynx to branching of R and L bronchi. Tracheal cartilages keep trachea stiff. These are C shaped cartilages – stiff to outside
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(facing neck) to protect, but open on the side facing esophagus – this allows esophagus to distend into trachea if necessary to swallow large portions of food. Cartilages are connected with elastic cartilage and muscle. Primary bronchi:
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This note was uploaded on 04/17/2008 for the course BIO 121 taught by Professor Short during the Fall '07 term at Finger Lakes Community College.

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respiratory - Respiratory system The link between the...

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