Multiple Choice
Parietal cells also produce intrinsic factor, a molecule that binds which vitamin in the stomach lumen?
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23. The Digestive System
Introduction to the Digestive System
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What is the slow, wavelike contraction that moves food through the digestive system called?
A
Segmentation
B
Mastication
C
Absorption
D
Peristalsis
Verified step by step guidance1
Step 1: Begin by understanding the key terms provided in the question. Segmentation refers to localized contractions in the intestines that mix food with digestive juices but does not move food forward. Mastication is the process of chewing food in the mouth. Absorption is the process of nutrients being absorbed into the bloodstream or lymph from the digestive tract.
Step 2: Focus on the term 'slow, wavelike contraction' mentioned in the question. This description aligns with the process of peristalsis, which involves rhythmic contractions of smooth muscle in the walls of the digestive tract to propel food forward.
Step 3: Recall the anatomy of the digestive system. Peristalsis occurs in organs such as the esophagus, stomach, and intestines, where smooth muscle contractions push food along the digestive tract.
Step 4: Understand the physiological mechanism of peristalsis. It involves alternating contraction and relaxation of circular and longitudinal muscle layers in the digestive tract, creating a wave-like motion.
Step 5: Confirm that peristalsis is the correct answer by comparing it to the other options. Segmentation mixes food but does not move it forward, mastication occurs in the mouth, and absorption happens after food is broken down. Peristalsis is the only process that matches the description of moving food through the digestive system in a slow, wavelike manner.
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