Question

gaseous exchange ......explain.

Answer 1

in a capillary is over that is used, hemoglobin meets a very different environment.

this tissue cells are continuously using oxygen, hence, the concentration of oxygen is quite low in them.

it might be only one third of that in the lungs.

as a concentration of oxygen is low, oxyhaemoglobin releases the oxygen molecule that enters the cell.

in the reactions that occur within cells in our body, carbon dioxide and water are produced and energy is released to be used up for different purposes.

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Answer 2

gaseous exchange is a delivery of oxygen from the lungs to the bloodstream , the elimination of carbon dioxide from the bloodstream to the lungs . it occurs in the lungs between aleveoli and a network of tiny blood vessels called capillaries, which are located in the walls of the aleveoli .
The walls of the aleveoli actually share membrane with the capillaries in which Oxygen and Carbon dioxide freely between the respiratory system and the bloodstream. Oxygen molecules attached to red blood cells, which travel back to the heart. at the same time , the carbon dioxide molecules in the alveoli are blown out of the body with the next exhalation .