• Ventilation muscles
– Intercostal muscles
• Used only during exercise, exertion, distress along with
accessory muscles, not used during quiet breathing
– Diaphragm
• Most important for ventilation
• When contracted, abdominal contents are pushed
downward, intercostal muscles move ribs upward AND
outward, which increases volume and decreases
pressure in the thoracic cavity
• Ventilation muscles– Intercostal muscles• Used only during exercise, exertion, distress along withaccessory muscles, not used during quiet breathing– Diaphragm• Most important for ventilation• When contracted, abdominal contents are pusheddownward, intercostal muscles move ribs upward ANDoutward, which increases volume and decreasespressure in the thoracic cavity
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