Question

explain the movements of the ribs in case of inhalation and exhalation
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Answer 1

during inhalation,the diaphagram and external intercostal muscles contract causing the rib cage to expand and move outward and expanding the thoracic cavity and lung volume.

during exhalation,the diaphragm and intercostal relax causing the thorax and lungs to recoil.

Answer 2

Answer:

During normal breathing, contraction of the major inspiratory muscle, the diaphragm, produces both rib cage expansion and a downward movement of the diaphragm. These movements cause the pressure around and in the lung to become negative relative to atmosphere.