A fundamental requirement of any immune defence system is its ability to distinguish between _______ and ________.
A) antibodies; antigens.
B) bacteria; viruses.
C) internal; external.
D) self; non-self.
E) erythrocytes; leukocytes.

Question

Quizplus · Accepted Answer

The immune system's fundamental requirement is its ability to distinguish between self (the body's own cells and molecules) and non-self (foreign substances, such as pathogens) to effectively protect the body without attacking its own tissues.

A Fundamental Requirement of Any Immune Defence System Is Its