Shipping boots/standing wraps cross-question?

When trailering you can put on either standing wraps or shipping boots. Well they prevent the blood from pooling in the lower legs, right? And why is the blood pooling bad? Also how do they prevent the blood from pooling?
They don't "Prevent blood from pooling".
They provide protection and sometimes support. Which may be why you think that they have to do with "blood pooling". When fluid collects surrounded by the legs, and cause them to swell up, people wrap them, which brings the swelling down. This because it provides a constant pressure.

Standing, or steady bandages, are primaraly used for this, or to keep a wound clean.

Shipping bandage cover the bulbs of the heel as well as the leg, and are to keep the legs from scrapes while shipping.
They truly prevent the horse from gashing open their legs if they should see out at the walls or step on themselves while in the trailer. They also give support to the horse's legs, because they are being pushed around contained by awkward ways by the trailer going in bumps, up hills, etc. I guess they could technically keep the blood from pooling by keeping their legs melt and keeping the circulation going because the horses aren't walking around.
Answers:    The swelling that occur when horses are trailered is the result of blood pooling in the extremities, since the veins rely on exercise to "pump" the blood back up through them toward the heart. When here is no exercise to do that, blood pools in the veins of the legs, since it continues to be pumped to the legs through the arteries, but can't get spinal column out of the legs through the veins at a rapid enough rate. The congestion and backup of blood surrounded by the veins results in leakage of plasma fluids from congested capillary, through their porous walls, and out into the tissues. Lymphatic capillaries that would normally be able to drain the fluids constantly entering the tissues are incapable of keeping up near the excessive amount extravasated from the pooled blood.
Only if wraps or boots were to be tight enough to supply sufficient compression to increase the velocity of blood flow through the veins would they be able to prevent the pooling of blood, and swelling that results. Most shipping boots and bandages a moment ago prevent injury from trauma. Wraps that enhance blood circulation require expertise to correctly apply, since considerable compression is required, without them being so tight that they damage the tissues.
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