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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.

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

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

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?

Which type of antigen would have the greatest immunogenicity?

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