During inspiration air passes into lungs due to ( ) a. Increased volume of thoracic cavity b. Fall in pressure inside the lungs c. Increase in the volume of thoracic cavity and fall in lung pressure. d. Muscular expansion of lungs
Answers
During inspiration air passes into lung due to (c) increase in volume of thoracic cavity and fall in lung pressure.
●Inspiration can occur if the pressure within lungs that is intra pulmonary pressure is less than atmospheric pressure so it creates pressure gradient .
●Increase in thoracic cavity causes increase in pulmonary volume which further decreases intra pulmonary pressure than atmospheric pressure which forces air from outside to move into the lungs.
During inspiration air passes into lungs due to increase in the volume of thoracic cavity and fall in lung pressure
Option C
Explanation:
Lungs are the breathing organ of many Animas including human. In human, the process of breathing is called negative pressure breathing. In this type of breathing, the actual work is done by the diaphragm and the intercostal muscles. They actually contract and relax in cycles decreasing the intra thoracic pressure.
Thus actually let’s the pressure inside the lung to fall as well and this expands, letting the air come inward through the trachea and bronchi. Thus, the lung gets filled with air. Just the opposite happens when expiration, except that inspiration is an active process, but expiration is a passive process.
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