GI Digestive System Anatomy 3 — Questions and Answers
Question 1: What is the primary function of the ileocecal valve?
- Absorption of vitamin B12
- Prevention of backflow from cecum into ileum (Correct answer)
- Secretion of digestive enzymes
- Regulation of gastric emptying
Correct answer: Prevention of backflow from cecum into ileum
The ileocecal valve (Bauhin's valve) prevents reflux of colonic bacteria and contents back into the small intestine.
Question 2: Which accessory digestive organ has both exocrine and endocrine functions?
- Liver
- Gallbladder
- Pancreas (Correct answer)
- Spleen
Correct answer: Pancreas
The pancreas secretes digestive enzymes (exocrine via acinar cells) and hormones including insulin and glucagon (endocrine via islets of Langerhans).
Question 3: The falciform ligament divides the liver into which two portions?
- Left and right lobes anatomically (Correct answer)
- Caudate and quadrate lobes
- Hepatic segments I and II
- Anterior and posterior segments
Correct answer: Left and right lobes anatomically
The falciform ligament is a peritoneal fold that divides the liver into the right and left anatomic lobes on its anterior surface.
Question 4: Which structure is the arterial supply to the greater curvature of the stomach along its upper portion?
- Right gastric artery
- Left gastroepiploic artery
- Short gastric arteries (Correct answer)
- Right gastroepiploic artery
Correct answer: Short gastric arteries
The short gastric arteries arise from the splenic artery and supply the fundus and upper greater curvature of the stomach.
Question 5: In which segment of the colon does water absorption occur most extensively?
- Sigmoid colon
- Descending colon
- Ascending colon and cecum (Correct answer)
- Transverse colon
Correct answer: Ascending colon and cecum
The cecum and ascending colon absorb the greatest amount of water and electrolytes from liquid ileal effluent.
Question 6: Which anatomical structure marks the transition from the foregut to the midgut?
- Gastroesophageal junction
- Pyloric sphincter (Correct answer)
- Ampulla of Vater
- Ligament of Treitz
Correct answer: Pyloric sphincter
The pyloric sphincter marks the boundary between the foregut (stomach) and midgut (duodenum onward to mid-transverse colon) in embryological terms.
Question 7: The porta hepatis transmits which structures into the liver?
- Hepatic veins and bile ducts only
- Portal vein, hepatic artery, and bile duct (Correct answer)
- Inferior vena cava and hepatic veins
- Portal vein and lymphatics only
Correct answer: Portal vein, hepatic artery, and bile duct
The porta hepatis (liver hilum) transmits the portal vein, hepatic artery proper, and common hepatic duct (portal triad), plus lymphatics and autonomic nerves.
GI Digestive System Anatomy 3
What is the primary function of the ileocecal valve?