What is immune system ?

Which immune system is formed by T-cells and what are their functions?

Which lymphocytes form the cell mediated immune system ?

In higher vertebrates the immune system can distingish self-cells and non-self. If this property is lost due to genetic abnormality and it attacks the self-cells, then it leads to

Which of the following is the unit of immune system?

What does the term "memory" of the immune system mean?

old people have weak immune system. What could be the reason?

Which of the following diseases affects the immune system directly?

Which lymphocytes form the hormonal immune system ?