Which one of the following statements about the muscles of respiration is correct?

Question

Answer

The diaphragm is active in both inspiration and expiration.

Answer

The most important expiratory muscle is the diaphragm.

Answer

Contraction of the external intercostal muscles causes the ribs to move upward and outwards.

Answer

Contraction of the diaphragm reduces the volume of the thoracic cavity.

Answer

Expiration muscles are always active during expiration.

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