Question

identify how the physical barriers of the immune system protect the body against pathogens. check all that apply. your nose produces oil to keep pathogens from entering the body through your nose skin contains tightly packed cells skin is tough, flexible, and waterproof you cough when a pathogen enters your mouth you sneeze when a pathogen enters your nose

Explanation:

1. Analyze "your nose produces oil to keep pathogens from entering the body through your nose": Nose produces mucus (not oil) to trap pathogens, so this is incorrect.
2. Analyze "skin contains tightly packed cells": The epidermis of skin has tightly packed epithelial cells, acting as a physical barrier, so this is correct.
3. Analyze "skin is tough, flexible, and waterproof": These properties of skin prevent pathogen entry, so this is correct.
4. Analyze "you cough when a pathogen enters your mouth": Coughing is a response (not a physical barrier) to expel pathogens, so this is incorrect.
5. Analyze "you sneeze when a pathogen enters your nose": Sneezing is a response (not a physical barrier) to expel pathogens, so this is incorrect.

Answer:

The correct options are:

• skin contains tightly packed cells
• skin is tough, flexible, and waterproof