Blood pooling occurs when the walls and valves of veins in human legs do not work effectively, thereby making it difficult for blood to return to the heart, according to Cleveland Clinic. This condition, known as chronic venous insufficiency, causes blood to pool in veins, a condition called stasis.Know More
Valves within veins in the legs become damaged, causing blood to leak backwards with the force of gravity instead of moving upwards. Valve damage happens due to aging, excessive sitting, extended standing and reduced mobility, notes Cleveland Clinic. Blood pressure in the affected veins remains elevated for long periods, which causes chronic venous insufficiency.
The causes of chronic venous insufficiency include blood clots, vascular deformations and pelvic tumors. Lack of blood flow or sluggish blood movement within leg veins leads to swollen legs. Other symptoms include aching legs, varicose veins, leathery-looking skin on legs, stasis ulcers and flaking skin on legs and feet. Untreated chronic venous insufficiency can lead to burst capillaries in the legs, according to Cleveland Clinic.
Dizziness may be another symptom of blood pooling in the legs. This occurs when someone suddenly stands up after sitting for long periods of time and blood pressure suddenly normalizes, notes Merck Manual. The heart rate increases, and blood vessels constrict rapidly when someone stands quickly after extended sitting.
One way to alleviate chronic venous insufficiency and blood pooling is to walk. The contraction of calf muscles during the walking motion moves blood more efficiently through the legs, according to the Society for Vascular Surgery.Learn more about Blood
The National Heart, Lung and Blood Institute states that valves located between the atria and ventricles of the heart are responsible for stopping blood backflow. These valves are known as the tricuspid and mitral valves.Full Answer >
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 oxygenated blood to the body, while the other loop, called the pulmonary loop, carries blood to and from the lungs so that blood can absorb oxygen.Full Answer >
The flow of blood through the heart can be traced by injecting a dye into the arteries through a procedure known as an angiogram. Another procedure, cardiac catheterization, involves using a catheter to inject the dye. Magnetic resonance angiography or MRA, uses MRI technology.Full Answer >
Blood enters the heart through two major veins at the right atrium before going to the right ventricle and to the lungs. When blood returns from the lungs, it goes into the left atrium and the left ventricle before leaving the heart to go to the rest of the body through the aorta, according to Cleveland Clinic.Full Answer >