How do we breathe? Explain the working of the respiratory system of our body.
Working Of The Respiratory System
The human respiratory system begins with the nose. The air then goes into the nasal passage. The nasal passages are lined with fine hairs. When air passes through the nasal passage, the dust particles and other impurities in the air get trapped in the nasal hair and mucus. Only clean air goes in, and the part of the throat between the mouth and windpipe is called the pharynx. From the nasal passage, air enters the pharynx and then goes into the windpipe. The trachea does not collapse even when there is no air in it because it is supported by the rings of soft bone called cartilage. The trachea runs down the neck and divides into two smaller tubes called bronchi at its lower ends. The bronchi are connected to the two lungs. The lungs are in the chest cavity, the thoracic cavity, which is separated from the abdominal cavity by a muscular partition called the diaphragm. Each bronchus divides in the lungs to form a large number of still smaller tubes called bronchioles. The pouch-like air sacs at the ends of the smallest bronchioles are called alveoli. The walls of alveoli are very thin, and they are surrounded by very thin blood capillaries.
When we breathe and we left our trip and flatten our diaphragm and the chest cavity becomes larger as a result. Because of this air is sucked into the lungs and fills the expanded alveoli. The alveoli are surrounded by thin blood vessels called capillaries, carrying blood in them so the oxygen or air diffuses out from the alveolar walls into the blood. Oxygen is carried by blood to all the parts of the body. As the blood passes through the tissues of the body, the oxygen present in a diffuses into the cells. The oxygen combined with the digested food present in the cells to release energy. Carbon dioxide gas is produced as a waste product during respiration in the cells of the body tissues. This carbon dioxide diffuses into the blood. Blood carries the carbon dioxide back to the lungs, where it diffuses into the alveoli. Then we breathe out air. The diaphragm and muscles attached to the ribs relax, which causes the chest cavity to contract and become smaller. The contraction movement of the chest pushes the carbon dioxide from the alveoli of the lungs into the trachea, then the nostrils, and then out of the body into the air.
– Written By Aruja
