3.
Draw a neat labelled diagram for mechanism of breathing in the
human lungs. Differentiate between inhalation and exhalation.
Answers
Explanation:
Exhalation (or expiration) is the flow of the breath out of an organism. In humans it is the movement of air from the lungs out of the airways, to the external environment during breathing.
This happens due to elastic properties of the lungs, as well as the internal intercostal muscles which lower the rib cage and decrease thoracic volume. As the thoracic diaphragm relaxes during exhalation it causes the tissue it has depressed to rise superiorly and put pressure on the lungs to expel the air. During forced exhalation, as when blowing out a candle, expiratory muscles including the abdominal muscles and internal intercostal muscles generate abdominal and thoracic pressure, which forces air out of the lungs.
Exhaled air is rich in carbon dioxide, a waste product of cellular respiration during the production of energy, which is stored as ATP. Exhalation has a complementary relationship to inhalation which together make up the respiratory cycle of a breath.
Inhalation and Exhalation
Explanation:
- Inhalation is the process of intake of air into lungs, whereas exhalation is the way toward letting let some circulation into from lungs
- The arrangement of air which is inhaled in is oxygen and nitrogen mix, while the composition of air which is breathed out is carbon dioxide and nitrogen mix
- Inhalation, the lung volume expands of the contraction as the stomach and intercostal muscles (the muscles that are associated with the rib cage), subsequently extending the thoracic cavity. Upon exhalation, the lungs recoil to drive the air of the lungs
