Which of the following terms refers to the foreign substances that enter the body?
A) Antigens
B) Leukocytes
C) Antibodies
D) Erythrocytes

Question

Quizplus · Accepted Answer

Antigens refer to foreign substances that enter the body and can trigger an immune response. Leukocytes are white blood cells involved in the immune response, but they are not the foreign substances themselves. Antibodies are proteins produced by the immune system in response to antigens. Erythrocytes are red blood cells involved in oxygen transport, but they have no role in the immune response or foreign substance entry.

Which of the Following Terms Refers to the Foreign Substances