1 An ad hoc network is a local area network (LAN) that is built spontaneously as devices connect. 2  Ad hoc testing is an informal and improvisational approach to assessing the viability of a product. 3  Ad hoc analysis is a business intelligence process designed to answer a single, specific business question.
The circulatory system and immune system serve the same, yet complementary purpose, to keep the entire body alive. The circulatory system does this by delivering oxygen from the lungs to every organ and cell in the body. The immune system does this by consuming foreign substances before they can damage the body. The connection between the circulatory system and immune system lies in the fact that the immune system travels through the entire body, inside the circulatory system. The circulatory system has three major components: the heart, the lungs, and blood vessels.
The circulatory system is the body's transport system. It is made up of a group of organs that transport blood throughout the body. The heart pumps the blood and the arteries and veins transport it.Oxygen-rich blood leaves the left side of the heart and enters the biggest artery, called the aorta. Sometimes, even though you don't feel well while it's happening, your body is fighting illness. 2  When the inflammatory response fails, the immune response goes to work. 3  This is the central part of the immune system and is made up of white blood cells, which fight infection by gobbling up antigens.