explain the process of breathing (inhalation and exhalation).
Answers
Answer: Breathing is part of life process called respiration which includes inhalation and exhalation.
Explanation:
Inhalation is the process of taking in oxygen rich air through our nose and exhalation is the process of giving out carbon dioxide rich air out through the nose. During inhalation the air from outside travels from high partial pressure to low partial pressure created in the lungs. during exhalation the opposite happens.
At the time of inhalation of air the diaphragm moves downwards and ribs moves outwards increasing the volume and decreasing the pressure. At the time of exhalation ribs moves inwards and diaphragm comes back to its original posistion thus decreasing the volume and increasing the pressure. Therefore the air travels from high pressure to low pressure and vice-versa.
During inhalation, the rib cage moves outwards and the diaphragm contracts to move downwards. As the rib cage expands, the space in the chest cavity increases allowing air rich in oxygen enter the lungs.
*During exhalation, the ribs move inwards and the diaphragm relaxes to return to its normal position. The contraction of rib cage reduces the size of the chest cavity. Now air rich in carbon dioxide is driven out of the lungs.