Question

How does exchange of gases take place in the tissues and in the alveoli ?

Answer 1

The exchange of gases, oxygen for carbon dioxide, takes place between the alveoli and the pulmonary capillaries.  This is known as the pulmonary exchange, and is part of the overall process of respiration, or breathing as we usually call it.  So these capillaries are woven into the tissue of the alveoli, and the exchange takes place in the connective tissue between them.  It also helps to think of capillaries - any capillary

Answer 2

Hey user,

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

hope it helps