Blog 5
Blood-Brain Barrier: Structure and Function
Two objectives drive the circulatory system. It first enables the delivery of nutrients and oxygen to organs and tissues. Second, it ensures that anything a tissue no longer requires is removed. Large blood channels called arteries are used to transport blood away from the heart. The arteries shrink at tissue locations, eventually forming arterioles and capillaries (Daneman & Prat, 2015). The tiniest blood veins are capillaries, which are where molecules are taken in and expelled. Here, undesirable carbon dioxide is discharged into the bloodstream while oxygen is absorbed by the tissue. These capillaries then combine to form venules, which then develop into veins, which are substantial blood vessels that carry anaemic blood to the heart.
Endothelial cells, which create a thick and sturdy inner lining in all of these blood arteries, are present. There are spaces that let molecules go back and forth between these cells. When the size of the vessels gets smaller, the gaps between endothelial cells get bigger relative to that. This is why the capillaries, which are small enough to reach almost anywhere in the human body, are where the majority of exchange occurs.
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