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13 Respiration pgs382-384

13 Respiration pgs382-384. 2 Phases External (physical) -movement of air in & out 500 cc/ml of air=Tidal volume Structures used:

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13 Respiration pgs382-384

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  1. 13 Respiration pgs382-384 • 2 Phases • External (physical) • -movement of air in & out 500 cc/ml of air=Tidal volume • Structures used: • a. Diaphragm-skeletal muscle activity—drop (contract) • increase chest volume decrease air pressure • result—inhalation (inspiration-air flows in) • -rise (relax) • decrease chest volume increase air pressure • video result—exhalation (expiration-air flows out) • b. Intercostal muscles-skeletal rib muscles • activity: lift ribcage—inhale • lower ribcage--exhale

  2. II. Internal Phase (chemical) • Intake & transport of O2—arterial blood • Use of O2 by cell—mitochondria—cellular respiration • O2+ C6H12O6 CO2 + H2O + 38 ATP’s (energy) • c. Removal of CO2 from cells—venous blood

  3. ANATOMY pgs 376-377 • Nares—entrance • Nasal Cavity & nasal septum: Function: conditions the air • a. Warm the air • b. Moisten the air • c. Clean the air • Olfactory nerves • Hard & Soft Palate • Pharynx-(throat)-common passage • uvula-extention of soft palate • tubes from ears • tonsils

  4. Larynx-(voice box)-formed by cartilage • -epiglottis-flap prevents choking • -glottis-opening between vocal cords • 7. Trachea (windpipe)-lined w/cilliated mucosa • -horseshoe shaped rings 8. Bronchus (2)-Primary bronchi right branch is larger 9. Bronchioles—tiny tubes bronchial tree 10. Alveolus—air sacs at end of bronchioles -thin walled covered w/surfactant -diffusion of O2 & CO2 11. Lungs—sealed cavity video

  5. Pleura—double-walled sac • -1 attached to lungs • -1 attached to thoracic cavity • -in between pleura cavity filled w/pleura fluid (lubricant) • Paranasal sinuses— • -lighten the skull • -resonance for sound • -produce mucous

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