These microscopic air sacs in your lungs are where the blood picks up oxygen to return it to the heart: A) AlveoliB) Bronchial TubesC) CapillariesD) Ventricles
These microscopic air sacs in your lungs are where the blood picks up oxygen to return it to the heart:
B) Bronchial Tubes
C) Capillaries
D) Ventricles
The lungs are a pair of spongy, air-filled organs located on either side of the chest. It consists of elastic sacs with branching passages into which air is drawn, so that the oxygen can pass into the blood and carbon dioxide be removed.
Correct answer: option A. Alveoli.
The alveoli are tiny, balloon-shaped air sacs located at the very end of the respiratory tree and are arranged in clusters throughout the lungs. They facilitate the gaseous exchange of oxygen and carbon dioxide between the inhaled air and the bloodstream. It is the place where the blood picks up oxygen to return it to the heart. Therefore option A. is correct.
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