Muscles pull ribs up and out l Expiration (during exercise) – Internal intercostals and abdominals Inspiratory movements l Pressure gradientīetween air inside and air outside lungs l Expiration (at rest) – Passive process l Diaphram relaxes l Pressureĭifferential (greater inside than out, so air moves out) Mechanics of Ventilation l Inspiration (during exercise) – External intercostals and scaleni To be pulled into lungs due to pressure differential – Degree of filling due to: l Magnitude of Rest) – Diaphragm contracts and moves downward l Causing outside air And Exercise The Pulmonary System Major Functions of Pulmonary System l Supply O 2 required in metabolism l Eliminate CO 2 produced in metabolism l Regulate to maintain acid-base balance Mechanics of Ventilation l Inspiration (at
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