Myasthenia gravis is due to

Each antibody has $...A...$ polypeptide chains, $...B...$ small chains called $....C...$ chains and $...D...$ longer chains called $.E...$ chains

The antibody, therefore, is represented as $...F...$

Here $A$ to $F$ refers to

Passive immunity can be obtained by injecting

Why is an antibody molecule represented as $H_2I_2$ ?

Choose the true statements

$I.$ Innate immunity is accomplished by providing different types of barriers

$II.$ Acquired immunity is present from the birth and is inherited from parents

$III.$ Sweat, tears, acid in the stomach and saliva prevent microbial growth

Given below the diagrammatic representation of lymph nodes

Label $A, B$ and $C$