Which of these is NOT one of the structures considered to be the immune system's first line of defense?
A) Skin
B) Mucous Membranes
C) B Cells
D) Tears
The B cells are not considered as first line defense structures of the immune’s system
Answer: Option C
Explanation:
Our body is protected internally by nature by many layers of defense. Any microbe or a foreign material that disturbs the body is defended by these barriers.
The first layer of defense required physical and chemical barrier such as the skin, mucous membrane, tears, saliva etc . The second line defense system involves the cells and the tissues that protect the body.
