write the steps involved in mechanism of respiration
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Describe the mechanism of respiration in man. Mechanism of respiration in man takes place in two phases, namely inspiration and expiration. Inspiration is the process of inhaling air into the lungs. During inspiration, the muscles of diaphragm contract and the diaphragm moves downward.
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Mechanism of respiration in Human:
Breathing or pulmonary ventilation.
External respiration.
Transport of O2 to tissue.
Internal respiration.
Transport of CO2 from tissue.
The mechanism of respiration involves the following four stages:
Breathing: It is a physical process in which oxygen rich air is taken inside the body (inspiration) and carbon dioxide rich air is forced out of the lungs (expiration).
Gaseous transport: Oxygen absorbed by the blood in the lungs is transported by Red Blood Cells (RBCs) as oxyhaemoglobin throughout the body by means of arteries. Carbon dioxide from the tissues is transported to the lungs by the blood via veins in two ways:
As bicarbonates dissolved in plasma
In combination with haemoglobin of RBCs as carbamino-haemoglobin
Tissue respiration: The terminal blood vessels or the capillaries transport oxygen to the body cells or tissues, where oxygen diffuses through their thin walls. Likewise, the capillaries pick up carbon dioxide released by them.
Cellular respiration: The complex chemical changes which occur inside the cells to release energy from glucose. Cellular respiration consists of three main stages - glycolysis, Krebs cycle and electron transport.
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