Question

Describe the mechanism of respiration in humans.

Answer 1

Mechanism of respiration involves five steps:-

1. Breathing or pulmonary ventilation: It involves both inhalation in which an adequate amount of oxygen is taken inside and exhalation involves removal of carbon dioxide with air.
2. External respiration: This is the exchange of oxygen to the blood and of carbon dioxide from blood to alveoli and is done due to their concentration gradient.
3. Transport of O${}_2$ to tissue: Oxygen binds to haemoglobin and reaches to tissues.
4. Internal respiration: As the concentration of oxygen is less and carbon dioxide is more in number the haemoglobin release oxygen and is absorbed by the tissue.
5. Transport of CO${}_2$ from tissue:- The carbon dioxide released by tissue transported in the form of bicarbonate, carbamino-haemoglobin and dissolved in the blood reaches to alveoli then diffuse from blood and released out.