Question

How is internal respiration different from external respiration?

Answer 1

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External Respiration:-

External respiration is basically the transfer of gas between respiratory organs such as lungs and the outer environment. It takes place prior to internal respiration. Internal respiration is the transfer of gas between the blood and cells.

External respiration also known as breathing refers to a process of inhaling oxygen from the air into the lungs and expelling carbon dioxide from the lungs to the air. Exchange of gases both in and out of the blood occurs simultaneously. External respiration is a physical process during which oxygen is taken up by capillaries of lung alveoli and carbon dioxide is released from blood.

Internal Respiration:-

Internal respiration or tissue respiration/cellular respiration refers to a metabolic process in which oxygen is released to tissues or living cells and carbon dioxide is absorbed by the blood. Once inside the cell the oxygen is used for producing energy in the form of ATP or adenosine triphosphate...

T.S ( Zayer ).

Answer 2

Answer :-

External respiration :-

• All animals require a medium for respiration.

• The process of gaseous exchange takes place between external environment and blood through respiratory organs.

• External respiration is the exchange of gases between the air spaces of the lungs and the blood in pulmonary capillaries.

• In external respiration, the blood in the pulmonary capillaries loses Carbon dioxide and gains Oxygen.

• The percentage of oxygen in inhaled air is about 21%.

• The percentage of oxygen in exhaled air is about 16%.

• The percentage of Carbon dioxide in the atmosphere is about 0.04%.

• The percentage of carbon dioxide in exhaled air is about 3.6%.

Internal respiration :-

• Internal respiration is the exchange of gases between the blood in systematic capillaries and tissue cells.

• When there is a difference in the partial pressures of gases, oxygen diffuses outwards from the arterial end of the capillaries into the surrounding tissues.

• Carbon dioxide diffuses from the tissues into the blood stream towards the venous end of the capillaries.