Inhalation is an active motion that causes the diaphragm to contract. During inhalation the diaphragm moves downward as it contracts, increasing the size of the chest cavity. This creates a space of emptiness, which causes air to enter in through the nose or mouth.
Exhalation is a passive process because muscle contraction does not occur. During exhalation, the diaphragm moves back up as the stretched lung bounces back to its normal position. As the lung returns to normal position, carbon dioxide, a waste product created by the body, moves out of the lungs through the mouth and
Exhalation is a passive process because muscle contraction does not occur. During exhalation, the diaphragm moves back up as the stretched lung bounces back to its normal position. As the lung returns to normal position, carbon dioxide, a waste product created by the body, moves out of the lungs through the mouth and