After the ileum, the chyme moves into the _____.

Question

BlackTom AI · Accepted Answer

After the ileum, chyme moves into the cecum.

1. Relevant knowledge points and concepts
- Anatomy of the intestinal tract: small intestine (duodenum → jejunum → ileum) empties into the large intestine (cecum → ascending colon → transverse colon → descending colon → sigmoid colon → rectum).
- Ileocecal valve: a sphincter at the junction between the ileum and the cecum that regulates passage of intestinal contents and helps prevent backflow.
- Functional roles: the small intestine is primarily for nutrient absorption; the large intestine (starting with the cecum) is for water/ion absorption and formation of feces.

2. Complete reasoning process step by step
- Step 1: Identify the terminal segment of the small intestine: the ileum.
- Step 2: Determine the immediate structure that receives chyme leaving the ileum: structures are connected in sequence; the ileum opens into the large intestine.
- Step 3: Specify the first part of the large intestine that directly follows the ileum: the cecum, accessed through the ileocecal valve.
- Step 4: Conclude that after the ileum, chyme enters the cecum.

3. Intermediate logical steps (no numeric calculations required)
- Small intestine order: duodenum → jejunum → ileum.
- Large intestine order: cecum → ascending colon → transverse colon...
- Junction: ileum → (through ileocecal valve) → cecum.

4. Why the correct answer is correct
- The cecum is anatomically the first segment of the large intestine and directly receives chyme from the ileum via the ileocecal valve, making it the immediate next location for chyme after the ileum.

5. Why the other options are incorrect
- Ascending colon: lies immediately after the cecum, not directly after the ileum.
- Descending colon: is much further along the large intestine on the left side; not directly after the ileum.
- Jejunum: is a proximal portion of the small intestine located before the ileum, so chyme does not move from ileum into jejunum.

6. Conclusion
This explanation confirms the correct answer: Cecum.

After the ileum, the chyme moves into the _____.单项选择题

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