NEET BIOLOGY

Detailed explanation-1: -During gas exchange oxygen moves from the lungs to the bloodstream. At the same time carbon dioxide passes from the blood to the lungs. This happens in the lungs between the alveoli and a network of tiny blood vessels called capillaries, which are located in the walls of the alveoli.

Detailed explanation-2: -The primary purpose of the lung is the exchange of the respiratory gases O2 and CO2 between ambient air and blood. The site of exchange is in the alveoli, where blood and gas are brought into very close proximity, a matter of approximately 1 micron.

Detailed explanation-3: -Final answer: The process of gaseous exchange in lungs between air and blood is called external respiration.

Detailed explanation-4: -Oxygen and carbon dioxide pass through these capillaries into the air sacs. As oxygen crosses over into the capillaries, the red blood cells capture it, while the carbon dioxide is unloaded into the lungs to be removed.

Detailed explanation-5: -The major way through which gases are exchanged is simple diffusion. Gases are exchanged externally at the surface of the alveoli of the lungs. Gases are exchanged internally at the tissue surface. Animals release carbon dioxide into the surrounding atmosphere and take up oxygen while respiration.