Final answer:
The spleen is the organ responsible for preventing the extravasation of blood and keeping blood circulation within the vessels. It filters and cleans the blood, and contains phagocytes and lymphocytes to combat infections.
Step-by-step explanation:
The organ that has the property of keeping the blood circulation within the vessels and preventing extravasation is the spleen. The spleen is a lymphatic organ located in the upper left quadrant of the abdomen, which contains phagocytes and lymphocytes that combat and prevent circulatory infections.
It acts as a filter for blood, playing a crucial role in removing damaged red blood cells and maintaining an environment free of microorganisms in the blood. Moreover, through homeostasis, it helps to prevent blood loss when a vessel is ruptured.
Other organs also play a role in the circulatory system: the liver and kidneys also filter blood, with the liver removing damaged red blood cells and the kidneys eliminating waste products through urine. However, it's the spleen that is chiefly responsible for managing blood cells and the immune response within the bloodstream.