Regional movements that occur in the small intestine and function to churn and fragment the digestive material are called:
(a) Segmentation
(b) Pendular movements
(c) Peristalsis
(d) Mass movements
(e) Mastication

검증된 단계별 안내

Step 1: Understand the types of movements in the digestive system. The small intestine exhibits several types of movements that help in digestion and absorption.

Step 2: Define each option: (a) Segmentation involves rhythmic contractions that churn and mix the intestinal contents, breaking them into smaller pieces without moving them forward significantly.

(b) Pendular movements are longitudinal muscle contractions that help move contents back and forth but are less involved in fragmentation.

(d) Mass movements are strong peristaltic waves in the large intestine that move fecal material toward the rectum.

(e) Mastication is the process of chewing in the mouth, not related to intestinal movements.

Step 3: Identify which movement specifically churns and fragments digestive material in the small intestine. This is the key to selecting the correct answer.

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주요 개념

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Segmentation

Segmentation refers to localized contractions in the small intestine that mix and churn the digestive contents. These movements help fragment food and enhance contact with digestive enzymes and absorptive surfaces, facilitating nutrient absorption.

Peristalsis

Peristalsis is a series of wave-like muscle contractions that move food along the digestive tract. Unlike segmentation, peristalsis primarily propels contents forward rather than mixing or fragmenting them.

Pendular Movements

Pendular movements are longitudinal muscle contractions in the small intestine that create a back-and-forth motion. This action helps mix intestinal contents but is less involved in fragmenting food compared to segmentation.

Regional movements that occur in the small intestine and function to churn and fragment the digestive material are called:(a) Segmentation(b) Pendular movements(c) Peristalsis(d) Mass movements(e) Mastication