The viscosity of blood is ________ proportional to the number of erythrocytes and _______ proportional to the amount of fluid.

Macrophages are the converted monocytes that phagocytize bacteria, cell fragments, dead cells, and debris.

   In this sagittal section showing the upper respiratory tract, what structure does number 5 indicate?

Breathing muscles such as the diaphragm are controlled by neurons of the _________ nervous system.

Compared to most interstitial fluid in the body, the interstitial fluid of an inflamed area would have a lower osmolarity and a lower concentration of proteins.

Which class of chemical messenger facilitates white blood cell formation in bone marrow?

Upon activation, a T-lymphocyte

Which type of cell responds to multiple antigens?

The antigen-antibody reaction is an example of the regulation function of blood.

Which type of antigen would have the greatest immunogenicity?