which describes the action of the diaphragm when it contracts?

a) during expiration, it depresses and retracts the ribs
b) during expiration, it elevates the floor of thorax
c) during inspiration, it depresses the floor of thorax
d) during inspiration, it elevates and protracts the ribs


c) during inspiration, it depresses the floor of thorax

Anatomy & Physiology

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Anatomy & Physiology