Return to Blog
Homepage
MCAT Biology Question — Digestive Tract
- by
- May 15, 2018
- MCAT Question of the Day
Digestion requires exposure of lumen contents to the inner surface of the digestive tract. The inner surface of the digestive tract is increased in surface area by:
A. relaxation of the pyloric sphincter
B. stomach mucosal cells
C. villi and convolutions
D. absorptive flagella
Click for Explanation
Villi increase surface area in the small intestine by extending small “finger-like” projections from the epithelial lining into the lumen. Microvilli are also present on the villi, further increasing surface area for digestion. Convolutions are folds along the length of the digestive tract which further increase surface area in comparison with a large diameter linear geometry.
A. relaxation of the pyloric sphincter, incorrect, Relaxation of the pyloric sphincter allows passage of chyme from stomach to duodenum.
B. stomach mucosal cells, incorrect, Stomach mucosal cells secrete mucous and have no effect on digestive surface area.
C. villi and convolutions, correct.
D. absorptive flagella, incorrect, There is no such thing as an absorptive flagellum.
Want more MCAT practice?
We’ve got options for every schedule and learning style!
From the best online MCAT course created by top instructors with 524+ MCAT scores to the most representative full-length practice exams and private tutoring, we can custom tailor your MCAT prep to your goals!
Not sure which option is right for you? Schedule a free MCAT consultation with an MCAT expert using the form below. No obligation, just expert advice.
Related Posts
Search the Blog
Free Consultation
Interested in our Online MCAT Course, One-on-One MCAT Tutoring or Med admissions packages? Set up a free consultation with one of our experienced Senior Student Advisors.
Schedule NowPopular Posts
-
-
MCAT Blog What's on the MCAT? -
-
-
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