When you are in the shoulder stand position, the blood gently rushes into the capillary network of the scalp.
As blood passes through the capillaries network in the papilla a liquid oozes out through the porous Walls of the capillaries to bathe the surrounding Cells. The liquid is tissue fluid and is similar to blood plasma; Oxygen which is released from the haemoglobin ot the red blood cells and the products of digestion (amino acids, fatty acids and glucose) are carried by the tissue fluid to the cells round the hair papilla, so enabling the chemical reactions to take place in the papilla. The result of the chemical reactions is hair growth.
Some of the tissue fluid re-enters the capillaries carrying waste carbon dioxide and some flow away in other channels called lymph vessels.
As we know blood travels around the body in a series of tubes in one direction only. When you go back into an upright position the force of gravity will speed up the Circulation of the blood back to the heart. Thus Creating a Siphon effect, increasing the rate of Chemical reactions in the hair root, thus improving hair growth.
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