Explain the schematic representation of gaseous exchange in tissues.
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Answer:
In the wake of providing oxygen to the body cells, the blood gathers carbon dioxide which is created by cell respiration in the cells. The tissues or cells have a high grouping of CO2 than the blood so carbon dioxide diffuses from high focus to low fixation. The blood conveys carbon dioxide to lung alveoli.
First of all the gaseous exchange takes place between the alveoli and blood. Here the alveoli have great partial pressure of oxygen and less partial pressure of CO2 while in blood the partial pressure of CO2 is more and partial pressure of O2 is less. So, exchange of gas takes place between blood and alveoli. The oxygen is transferred to blood and CO2 is transferred to alveoli. Same thing happens between blood and cells or other body tissues. Here the partial pressure of oxygen is more in blood and less in tissues while the partial pressure of CO2 is more in tissues and less in blood. So, exchange of gases takes place and tissues receive oxygen from blood and transfer CO2 to blood. In this way tissue receives oxygen.