Biology Digestion/Nutrition NUMS 2023
PMDC Verified Question 21 of 48
Digestion of which food component starts in oral cavity?
A
Proteins
B
Fats
C
Carbohydrates
D
Vitamins
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Carbohydrates
Concept:

Enzymatic breakdown is strictly compartmentalized based on the specific enzymes secreted in different regions of the gut.

Formula:

N/A

Solution:

  • The oral cavity is equipped with salivary glands that secrete salivary amylase (ptyalin).
  • Amylase is an enzyme designed exclusively to break the glycosidic bonds found in Carbohydrates (specifically starch and glycogen).
  • Therefore, chemical carbohydrate digestion begins the moment food enters the mouth.


Why other options are incorrect:

Protein digestion begins in the stomach via pepsin. Major fat digestion begins in the small intestine via pancreatic lipase (though minimal lingual lipase exists, carbs are the primary target). Vitamins are generally absorbed intact, not digested.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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