NEET BIOLOGY

Detailed explanation-1: -Oxygen is taken up by the alveoli while carbon dioxide is released through their walls. The air that is exhaled contains a higher concentration of carbon dioxide. This gaseous exchange between the alveolar walls and the bloodstream is called external respiration.

Detailed explanation-2: -2. External Respiration Exchanges Gases Between the Lungs and the Bloodstream. Inside the lungs, oxygen is exchanged for carbon dioxide waste through the process called external respiration. This respiratory process takes place through hundreds of millions of microscopic sacs called alveoli.

Detailed explanation-3: -In external respiration, oxygen diffuses across the respiratory membrane from the alveolus to the capillary, whereas carbon dioxide diffuses out of the capillary into the alveolus.

Detailed explanation-4: -External respiration is the formal term for gas exchange. It describes both the bulk flow of air into and out of the lungs and the transfer of oxygen and carbon dioxide into the bloodstream through diffusion.

Detailed explanation-5: -At each cell in your body, oxygen is exchanged for a waste gas called carbon dioxide. Your bloodstream then carries this waste gas back to the lungs where it is removed from the bloodstream and then exhaled. Your lungs and respiratory system automatically perform this vital process, called gas exchange.