Which of the following statements are true about motility in the small intestine: I. Peristalsis will generally propel chyme towards the ileocecal valve. II. The efficiency of chemical digestion can be increased through segmentation. III. Peristalsis and segmentation use the same muscles, but contract in different patterns.
A
I only.
B
II only.
C
I & II.
D
I & III.
E
II & III.
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1
Understand the concept of peristalsis: Peristalsis is a series of wave-like muscle contractions that move food through the digestive tract. In the small intestine, peristalsis helps propel chyme towards the ileocecal valve, which is the junction between the small intestine and the large intestine.
Understand the concept of segmentation: Segmentation involves contractions of the circular muscles in the digestive tract, which helps mix the chyme and increase the efficiency of chemical digestion by bringing it into contact with digestive enzymes and the absorptive surfaces of the intestine.
Analyze statement I: Peristalsis will generally propel chyme towards the ileocecal valve. This statement is true because peristalsis is responsible for moving the contents of the small intestine towards the large intestine.
Analyze statement II: The efficiency of chemical digestion can be increased through segmentation. This statement is true because segmentation enhances the mixing of chyme with digestive juices, improving digestion and nutrient absorption.
Analyze statement III: Peristalsis and segmentation use the same muscles, but contract in different patterns. This statement is true because both processes involve the smooth muscles of the intestine, but they contract in different patterns to achieve different functions.