Question

______ are produced by the immune system in the body of a healthy person in order to stop the growth of foreign substances such as viruses and bacteria. which choice below correctly completes the sentence? red blood cells hormones antibodies steroids

Explanation:

Red blood cells transport oxygen, not fight foreign substances. Hormones are chemical messengers for bodily regulation. Steroids are a type of lipid with various functions, not immune response molecules. Antibodies are proteins made by the immune system to target and neutralize foreign invaders like viruses and bacteria.

Answer:

Antibodies