External respiration refers to exchange of gases between

Inspired air and blood

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Blood and tissue fluid

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Alveolar air and tissue fluid

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Environmental air and lungs

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Solution

The correct option is D Environmental air and lungs
Pulmonary gas exchange takes place in the lungs between the alveoli and the blood. It is also referred to as external respiration as it involves the respiratory processes that have contact with the external environment. The process of pulmonary gas exchange removes $C O_{2}$ from the blood and replenishes the bloods $O_{2}$ supply.

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Similar questions

The exchange of gases between inhaled air and blood is referred as ______ respiration

The exchange of oxygen and other gases between air in the lungs and blood vessels takes place in:

Respiration in insects is called direct because

(a) the cells exchange $O_{2} / C O_{2}$ directly with the air in the tubes

(b) the tissues exchange $O_{2} / C O_{2}$ directly with the air in the tubes

(d) tracheal tubes exchange $O_{2} / C O_{2}$ directly with the haemocoel which then exchange with tissues

The exchange of gases between inhaled air and blood is referred to as ______.

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