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I begin my journey in a capillary, the movement in here is very slow due to an apparent low pressure, and the walls are only one cell thick to allow substances to diffuse out of the blood
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I begin my journey in a capillary, the movement in here is very slow due to an apparent low pressure, and the walls are only one cell thick to allow substances to diffuse out of the blood e.g. oxygen and are very thin. In front and behind me I can see other red blood cells like myself. They have no nucleus to allow more space to carry oxygen, and are small biconcave disc- shaped cells filled with a red pigment called haemoglobin. As I squeeze through the capillary walls, I see in the distance a cauliflower-shaped sac, as I got closer it was revealed to me that this 'bunch of grapes' was an alveoli, as I looked round there were thousands of them branching off from the trachea - the 'flexible hose of a vacuum'. The windpipe as it is more commonly called is held open by rings of cartilage,...
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