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

Poor circulation can cause redness in the toes, tingling sensations and foot cramps, according to FootSmart. The toes may also turn blue to purple in color. Skin discoloration is often due to venous insufficiency, a cond... More »

Abnormal circulation can cause skin discoloration, including blue, white or red hands, according to the University of Chicago Medical Center. However, poor circulation normally results in white or bluish skin, and rednes... 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 »

According to the University of Cincinnati's Clermont College, human beings have double circulation, which means that there are two separate loops through which blood travels. One loop, called the systemic loop, takes oxy... 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 »