Friday, 20 February 2015

The Blood Circulation


The circulatory system or circulatorioa system is the anatomical structure composed of the cardiovascular system leading ago and circulate blood, and lymphatic system leading lymph unidirectionally toward the heart. In humans, the cardiovascular system consists of the heart, blood vessels (arteries, veins and capillaries) and blood, and lymphatic system is comprised of lymphatic vessels, lymph, the lymphoid organs (spleen and thymus), bone marrow, lymphoid tissues (such as the amygdala and Peyer's patches) and lymph.

Blood is a fluid type specialized connective tissue with a liquid colloidal matrix, a complex and a characteristic red color constitution. Is a solid phase (formed elements, including leukocytes (white blood cells), erythrocytes (or red blood cells), platelets and a liquid phase, represented by blood plasma.

Lymph is a clear fluid that runs through the lymphatic vessels and pigments generally lacks. It occurs after the excess fluid from the capillaries into the interstitial or intercellular space, and is picked up by the lymphatic capillaries that drain thicker lymph vessels to converge in ducts that empty into the subclavian veins.

The main function of the circulatory system is to pass nutrients (such as amino acids, electrolytes and lymph), gases, hormones, blood cells, among others, body cells, metabolic waste collected to be eliminated by the kidneys after in the urine and exhaled air in the lungs, rich in carbon dioxide (CO2). In addition, defends the body against infection and helps to stabilize the temperature and pH to maintain homeostasis.