Infections generally result in an increase in the number of. 1) alveoli. 2) erythrocytes. 3) platelets. 4) leukocytes

The correct answer among the choices listed is option 4. Infections generally result in an increase in the number of leukocytes or white blood cells. An increase in the number of white blood cells in circulation is called leukocytosis. This increase is commonly caused by inflammation.