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Unformatted text preview: Anatomy & Physiology II Notes 3/29/07 Respiratory System Need oxygen because it is the last electron acceptor (needed to make ATP) Path of air: inhale through nose or mouth pharynx trachea trachea branches into two bronchi (one to each lung) bronchi branch into bronchioles bronchioles open into air sacs called alveoli o Lungs are essentially the alveoli and blood vessels not dense (mostly air) o Inhaling through nose is advantageous, especially if it is cold because the hair has an opportunity to warm up, nose hairs also filter any particles from the air Epiglottis cartilaginous structure that prevents anything besides air from entering the trachea, acts like a lid and closes when we swallow and forces food and fluid into the esophagus o Heimlich maneuver Vocal cords vibrate to make sound Trachea cartilaginous structure, stiffer than the esophagus...
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