Alveoli are ____ in size and ____ in numbers (Millions in each lung). The surface of alveoli and the walls of the capillaries are very ____ and ____ which helps the exchange of the gases. The alveoli and capillaries touch each other so there is a short distance for ____ (short diffusion pathway). Each alveolus is surrounded by a ____ of blood capillaries so there is a rich supply of blood for the gases to diffuse into/from. ____ is the red pigment found in red blood cells . It is the haemoglobin that carries and transports the ____ around the body. ____ is also carried in red blood cells combined with haemoglobin. When diffusing into the blood, oxygen combines with haemoglobin forming ____.

Gaseous Exchange

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