Final answer:
Hair in the nose, mucous membranes, and saliva and tears are the three parts of the body that produce mucous or fluids to protect against external pathogens.
Step-by-step explanation:
The three parts of the body that produce mucous or fluids to protect against external pathogens are:
- Hair in the nose: The hairs in the nose act as a physical barrier, trapping pathogens and preventing their entry into the body.
- Mucous membranes: Mucous membranes line various body openings and secrete mucus, which traps pathogens. They also have cilia that move trapped pathogens towards body openings for removal.
- Saliva and tears: Saliva in the mouth and tears in the eyes contain enzymes and antibodies that help to kill pathogens.