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Exhalation

Intercostal Muscles

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INTERCOSTAL MUSCLES Inhalation and exhalation make up 1 breath Internal intercostal muscles External intercostal muscles Sternum Inhalation ? Also termed inspiration ? Diaphragm contracts and flattens. ? Internal intercostal muscles relaxes ? While the external intercostal muscles contract ? The rib cage moves up and out. ? Enlarging the thoracic cavity and decreases the air pressure within. ? Air from the surrounding enters the lungs Exhalation ? Also termed expiration ? Diaphragm relaxes and arch upwards. ? Internal intercostal muscles contracts ? While the external intercostal muscles relaxes ? The rib cage moves down and in. ? Air is forced out of the lungs Summary

Respiratory System

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RESPIRATORY SYSTEM SUMMARY Nitrogen 78% COMPOSITION OF AIR Oxygen 21% Argon 0.93% CO2 0.038% Others 0.008% INHALED & EXHALED AIR inhaled air nitrogen (78%) oxygen (20%) carbon dioxide (0.04%) Other gases exhaled air nitrogen (78%) oxygen (16%) carbon dioxide (4%) Other gases Exhaled air contains less O2, but much more CO2 Respiratory system Mechanical respiration Inhalation Exhalation Cellular respiration Glucose+O2?CO2+H2O+ATP(energy) Respiratory system Mechanical respiration Inhalation Exhalation Cellular respiration Glucose+O2?CO2+H2O+ATP(energy) MECHANICAL RES: INHALATION ? Also termed inspiration ? Diaphragm contracts and flattens. ? Internal intercostal muscles relaxes

Biology Lung

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THE ?LUNG ? MODEL ? OBJECTIVES ?? To create a lung model to show the effects of inhalation and exhalation and the effects of respiratory diseases on the function of lungs. PARTS OF THE RESPIRATORY SYSTEM 1. ?Trachea ? 2. ?Lungs ? 3. ?Diaphragm ? RECAP ?I: ?INHALATION ? 1.?Diaphragm ? contracts ?and ? ?a?ns ? 2.?Rib ?cage ?moves ?up ? and ?out ? ? ?? Thoracic ?cavity ? enlarges ? ?? Lower ?pressure ? within ?the ?lungs ? ?? Air ?enters ?the ? lungs ? RECAP ?II: ?EXHALATION ? 1.?Diaphragm ?relaxes ? and ?moves ?up ? 2.?Rib ?cage ?moves ? ? down ?and ?in. ? ? ?? Rib ?cage ?presses ? on ?the ?lungs ? ?? Air ?is ?forced ?out ?
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