Question

during inspiration, diaphragm becomes:
a) concave b) convex c) straight d) one of these
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Answer 1

ANSWER
When the internal intercostal muscles contract and diaphragm relax, the ribs move .downward and inward and diaphragm becomes convex {dome shaped), thus decreasing the volume of thoracic cavity and increasing the pressure inside as compared to the atmospheric pressure outside. This will cause the air to move out (expiration).