Atherosclerosis is the most common cause of poor blood circulation, according to Other possible causes are venous thrombosis, insufficient exercise, tight-fitting clothing and stress. More » Science Human Anatomy Blood

Symptoms of poor circulation in the legs include numbness and burning, achy leg muscles, poorly healing sores and shiny skin and loss of hair on the legs, according to WebMD. Legs that feel cooler than arms and a light p... More »

Diabetics have poor circulation because the high blood glucose levels which they experience over a period of years lead to blood vessel damage, according to When the blood vessels are damaged, they are un... More »

Double circulation in humans refers to two different circuits of blood circulation, according to the BBC. Humans and all other mammals have double circulatory systems. One circuit takes blood to the lungs to pick up oxyg... More »

Thick blood is caused by a variety of conditions, such as heavy proteins in the blood, too much blood in circulation or a blood clot system imbalance, according to Southeastern Medical Oncology Center. Diseases such as c... More »

The pathway of blood circulation is broken into two different circulatory pathways, states the National Cancer Institute. The pulmonary circuit transports de-oxygenated blood from the right ventricle into the lungs to be... More »

Blood circulation is regulated by the circulatory system, and blood is distributed throughout the body by the heart. It flows from the heart into arteries that branch into smaller veins and capillaries. More » Science Human Anatomy Blood