Which component of blood passes through blood vessel walls into surrounding tissues to defend the body against invading foreign antigens?
A. Red blood cells
B. Platelets
C. Leukocytes
D. Gamma globulin
Answer:C
Which component of blood passes through blood vessel walls into surrounding tissues to defend the body against invading foreign antigens?
A. Red blood cells B. Platelets C. Leukocytes D. Gamma globulin