Return to Blog
Homepage
PCAT Biological Processes – Respiratory Defenses
- by
- Apr 19, 2018
- PCAT Question of the Day
All of the following protect the respiratory system from inhaled pathogens and foreign objects EXCEPT:
A. mucus produced by goblet cells.
B. cilia lining the epithelium of the trachea.
C. surfactant that coats the tracheal surface.
D. the epiglottis.
Click for Explanation
C is correct. Surfactant is found in the alveoli and serves to reduce surface tension; it does not coat the tracheal surface to protect against pathogens. Goblet cells do produce mucus, which traps small particulate matter, and the tracheal epithelium contains cilia that push mucus and particles toward the back of the throat. Finally, the epiglottis closes while eating to protect the lungs from swallowed objects, in particular food.
Related Post
Search the Blog
Free Consultation
Interested in our Online MCAT Course or one of our One-on-One MCAT Tutoring packages? Set up a free consultation with one of our experienced Academic Managers!
Schedule NowPopular Posts
-
-
-
-
-
MCAT Blog How to Review MCAT Full-Lengths
Free MCAT Practice Account
Need great MCAT practice?Get the most representative MCAT practice possible when you sign up for our free MCAT Account, which includes a half-length diagnostic exam and one of our full-length MCAT practice exams.
Learn More
Submit a Comment