Immune surveillance is a process in which _______ nonspecifically detect and destroy foreign cells and diseased host cells.

A. 5:Hemoglobin molecules do not bind five oxygen molecules; this exceeds their structural capacity.

B. 4:Each hemoglobin molecule has four heme groups, and each heme can bind one oxygen molecule. Therefore, one hemoglobin molecule can carry a maximum of four oxygen molecules.

C. 2:Hemoglobin can carry more than two oxygen molecules; two would only represent half-saturation of the molecule.

D. 6:Six oxygen molecules exceed the binding capacity of hemoglobin and are not physiologically possible.

E. 3:Hemoglobin can bind three oxygen molecules, but this is not the maximum capacity. Four is the full complement when fully saturated.

A. Self-antibodies:Self-antibodies are produced as a result of autoimmune activity, but they are not the components the immune system fails to recognize. They are the outcome of the immune system mistakenly targeting self-components.

B. Self-immunoglobulins:Immunoglobulins are antibodies, not the body’s own antigens. The immune system does not fail to recognize immunoglobulins themselves; rather, it may produce antibodies against self-antigens.

C. Self-antigens:Autoimmune diseases occur when the immune system cannot distinguish self-antigens from foreign antigens. This failure leads to an immune response against the body’s own tissues, causing inflammation and tissue damage.

D. Self-interleukins:Interleukins are signaling molecules that mediate immune responses. The immune system does not target them in autoimmune diseases, so they are not the primary issue in self-recognition failures.

E. Self-complement proteins:Complement proteins assist in immune defense but are not mistaken as foreign in autoimmune diseases. The immune system targets tissues containing self-antigens rather than the complement system itself.