PATHOLOGY

Detailed explanation-1: -An Antibody Molecule Is Composed of Heavy and Light Chains The basic structural unit of an antibody molecule consists of four polypeptide chains, two identical light (L) chains (each containing about 220 amino acids) and two identical heavy (H) chains (each usually containing about 440 amino acids).

Detailed explanation-2: -Definition. An antibody is a protein component of the immune system that circulates in the blood, recognizes foreign substances like bacteria and viruses, and neutralizes them.

Detailed explanation-3: -Antibodies are produced by B-lymphocytes. These antibodies are responsible for humoral immunity, which is a type of acquired immunity. Each antibody is Y-shaped and made up of four peptide chains, namely two light chains and two heavy chains.