Question

I WILL MEDAL AND FAN


Which of the following are part of the body’s first line of defense against pathogens?

A.
white blood cells

B.
red blood cells

C.
lymph nodes

D.
mucous membranes

Answer 1

white blood cells

Answer 2

idk

Answer 3

mucus
Tears, mucus and saliva
Your nose, mouth and eyes are obvious entry points for pathogens. However, tears, mucus and saliva contain an enzyme that breaks down the cell wall of many bacteria. Those that are not killed immediately are trapped in mucus and swallowed. Special cells line and protect the nose, throat and other passages within your body. The inner lining of your gut and lungs also produces mucus to trap invading pathogens.