How does pulmonary volume increase during inspiration?
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The left side of the heart responds differently to the respiratory cycle. During inspiration, expansion of the lungs and pulmonary tissues causes pulmonary blood volume to increase, which transiently decreases the flow of blood from the lungs to the left atrium.
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Contraction of diaphragm which flattens it, contraction of external intercoastal muscles and expanding of ribs...
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