Which are the oxygen-carrying cells of the body?
_________________ mainly controls the level of oxygen in the tissues.
d. Adrenocorticotropic hormone.
Erythrocytes, leukocytes, and platelets are considered to be the
_____________________ of (in) the blood.
a. Coagulation factors.
b. Immunologic functions.
Which cells possess the powers of locomotion and phagocytosis?