During Expiration The Diaphragm Becomes ________
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Answer:During expiration the diaphragm becomes dome-shaped, because muscle fibres of diaphragm relax making it convex (i.e., dome-shaped) thereby decreasing the volume of thoracic cavity.
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The relaxation of external intercoastal muscles leads ribs and rib cage downwards and inwards respectively and this results in reduction in thoracic volume in anteroposterior direction. Hence, diaphragm becomes dome shaped during expiration as shown in the figure. So, the correct answer is 'Dome-shaped'.
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