The line of defense that is his immune system exhibiting is that of "first line of defense." There are only 3 lines of defense in the immune system. The first line of defense are a combination of physical and chemical barriers that prevent all types of foreign agents from penetrating the outer layer of the body. In this case, it is the nasal cavity.
Above. The heart is SUPERIOR to the diaphragm. ... The liver is INFERIOR to the diaphragm. Anterior (Ventral) Toward the ventral side, toward the front or belly.
