Thursday, 2 April 2015

Blood Circulation


The circulatory system or cardiovascular is the set of organs responsible for the transport of various fluids - such as blood and, in a more general, the sap - who have the primary task to make the necessary nutrients for the body's cells their livelihood.

In the human being and in all vertebrates, the heart is the body and blood of the engine is the central element of the apparatus, which also includes the blood vessels (arteries and veins) and lymphatic vessels.

Closely related to the circulatory organs are then hematopoietic and lymphoid organs, which are responsible for the continuous production of formed elements in the blood and lymph.

In the different groups of multicellular animals circulation ensures the survival of the organism and the metabolism of every cell of the body, provides chemicals and maintains the physiological properties. The blood carries oxygen from the lungs to the cells and carbon dioxide in the opposite direction (see also breathing).

From the digestive processes that occur in the digestive system, derived nutrients such as lipids, sugars and proteins that are transported in each tissue, there used and, if necessary, can be further modified or conserved. The substances that remain from the metabolism, also referred to as waste products or catabolites (for example, urea and uric acid), are then eliminated from other tissues or organs (such as the kidneys and the colon).

The blood also carries the chemical messengers such as hormones, cells of the immune system and the components of blood clotting in the body.