Blood circulation and its importance

About blood circulation

Human blood circulation (vascular system) is a system that permits blood to circulate through the body and transport nutrients, i.e. everything else our body needs.

The circulation of blood through a complex network of blood vessels provides nourishment to all human tissues.

The metabolism of every single cell is provided for, enabling the survival of the entire organism.


How blood moves through the body

Oxygenated blood full of nutrients is carried by arteries to all organs and the most remote cells in our bodies.

The heart pumps oxygenated blood through the arteries.

Veins collect utilised blood, now filled with waste materials, and send it via venous valves back to the heart. The blood is pushed from the heart into the lungs where gas exchange occurs, whereby carbon dioxide is released from the blood and oxygen is absorbed, and the whole cycle starts all over again.


Tasks and function

The blood performs many tasks in the human body.  It transfers oxygen to all tissues, where it collects carbon dioxide and returns it back to the lungs. Along with oxygen, nutrients from the digestive system are carried to all tissues and the blood then transports waste materials to excretion organs (kidneys, intestines).

Blood also carries hormones between various systems of organs. The immune system components and blood cells in charge of coagulation get to the destinations where they are needed.


Circulation plays an important role in the regulation of body temperature. Depending on the blood quantity in the skin, the „loss“ of warmth to skin is determined.