HUMAN PHYSIOLOGY
BREATHING AND RESPIRATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Inspiration-pump mechanism
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Expiration-pump mechanism
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Suction-pump mechanism
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Sensory-motor mechanism
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Detailed explanation-1: -During inhalation process, the diaphragm contracts and moves down. The ribcage moves upwards and outwards and expands. This results in increasing the volume of the chest cavity and reduces the pressure inside it as volume is inversely proportional to pressure.
Detailed explanation-2: -When the lungs inhale, the diaphragm contracts and pulls downward. At the same time, the muscles between the ribs contract and pull upward. This increases the size of the thoracic cavity and decreases the pressure inside. As a result, air rushes in and fills the lungs.
Detailed explanation-3: -Breathing involves the movement of the diaphragm and the rib cage. During inhalation, ribs move up and outwards and diaphragm moves down. This movement increases space in our chest cavity and air rushes into the lungs. The lungs get filled with air.