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Site of gaseous exchange in lungs is
Explanation
The alveoli are the primary sites of gaseous exchange in the human lungs. These are tiny, balloon-like air sacs located at the end of the respiratory tree (bronchioles). They provide a massive surface area and possess extremely thin walls (one-cell thick), which are in direct contact with a dense network of pulmonary capillaries. This structure allows oxygen to diffuse into the blood and carbon dioxide to diffuse out of the blood into the lungs.
- Tracheoles are the fine respiratory tubes found in insects, not humans.
- Bronchioles are the smaller air passages that conduct air to the alveoli but are not the site of gas exchange.
- The pulmonary vein is the blood vessel responsible for carrying oxygen-rich blood from the lungs back to the left atrium of the heart.
SIMILAR QUESTIONS
During respiration in human beings, the actual place of gaseous exchange is
In which of the following parts of organisms, the process of gaseous exchange during respiration does not take place?
Which of the following properties of alveoli is/are helpful in gaseous exchange during respiration in human beings?
I. The epithelial lining of alveoli is very thin.
II. Elastic fibres are present in alveolar wall.
III. Wall of alveoli is surrounded by many blood capillaries.
Select the correct answer using the code given below.
The only vein that carries oxygenated blood is :