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Inspiration Intra-Thoracic volume increases Inspiration Intra-Alveolar volume increases Inspiration Alveolar Volume increases Inspiration Atmospheric pressure is Positive Inspiration External intercostal muscles contract Inspiration Serratus Anterior muscles contract Inspiration Diaphragm contracts Inspiration Pectorlis minor contracts Inspiration Sternocleidomastoideus contracts Inspiration Diaphragm moves inferiorly Inspiration Triggered when carotid and aortic body chemoreceptors detect a decrease in PO2 concentration in the blood stream Inspiration Abdominal muscles relax Inspiration Intra-thoracic pressure decreases Inspiration Intra-alveolar pressure decreases Inspiration Alveolar pressure decreases Inspiration Alveolar pressure is negative Inspiration Intra-alveolar pressure is negative Inspiration Internal intercostal muscles relax Inspiration Trigggered when brain detects increase in PCO2 in the blood Inspiration Triggered when brain detects increase in hydrogen ion concentration in blood