21. The Immune System
Physical Barriers in First-Line Defenses: Mucous Membrane
Problem 20.7a
Textbook Question
Textbook QuestionMark the following statements as true or false. If a statement is false, correct it to make a true statement.
a. Surface barriers contain substances in their secretions that kill pathogens and deter their growth.
![](/channels/images/assetPage/verifiedSolution.png)
This video solution was recommended by our tutors as helpful for the problem above
Video duration:
0m:0sPlay a video:
78
views
Was this helpful?
Related Videos
Related Practice
Showing 1 of 9 videos