A) antibodies
B) RBCs
C) haemoglobin
D) none of these
Correct Answer: A
Solution :
Resistance against pathogens is due to antibodies. The immune system has two main functions : (i) recognization of atom of invading pathogens, (ii) destruction of pathogens. The humoral immune system relies B-lymphocytes to produce soluble antibodies that will bind the foreign antigens. The cellular immune system uses killer T-lymphocytes that recognize and destroy invading cells direcdy.
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