Blood flow can be affected by restriction forces, specifically blood vessels. A smaller blood vessel diameter creates more friction between the blood and the blood vessel and restricts blood flow. When a blood vessel is dialated, the blood vessel diameter is larger and blood can flow more easily. The human body uses this technique to control blood pressure. When someone works out, blood flow is increased to the contracting muscles. In this time blood is also restricted to areas of the body that are not involved in the work out. When a person in cold, blood vessels that are not supplying blood to digestive organs are restricted. Blood vessels supplying blood to digestive organs are dialated to increase the break down of glucose.
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