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Question
In human beings, rib case and sternum move upwardly and outwardly during.
In human beings, rib case and sternum move upwardly and outwardly during.
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Solution
The correct option is D Inspiration
As the rib cage and sternum (breast bone) move upward and outward, the thoracic volume would increase and with this the pulmonary volume would also increase. This would create a negative pressure gradient in lungs, which would mean pressure in lungs less than the atmosphere. Thus, inspiration would happen. Hence, Option D is correct.
As the rib cage and sternum (breast bone) move upward and outward, the thoracic volume would increase and with this the pulmonary volume would also increase. This would create a negative pressure gradient in lungs, which would mean pressure in lungs less than the atmosphere. Thus, inspiration would happen. Hence, Option D is correct.
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