Intermediate Lacteals (Intestinal Lymph Capillaries) Quiz

Q1. Within which histological layer of an intestinal villus is the lacteal located?

• Submucosa outside the villus
• Lamina propria
• Serosa only
• Muscularis externa

Q2. Why can chylomicrons enter lacteals more readily than ordinary blood capillaries?

• Lacteal endothelium is adapted for uptake of large lipid particles
• Lacteals have thick muscular walls
• Chylomicrons are smaller than water molecules
• Blood capillaries lack endothelium

Q3. Which nutrients generally enter villous blood capillaries rather than lacteals?

• Large lipid droplets
• Monosaccharides and amino acids
• Most lymphocytes
• Chylomicrons containing long-chain triglycerides

Q4. What is the first lymphatic structure entered by chylomicrons after leaving enterocytes?

• Lacteals
• Hepatic sinusoids
• Inferior vena cava
• Portal venules

Q5. How does lymph move from a lacteal toward larger intestinal lymphatic vessels?

• By direct pumping from the heart
• By arterial systolic pressure alone
• Through lymphatic drainage aided by intestinal and villous movement
• Through the common bile duct

Q6. Which structural feature distinguishes a lacteal from a villous blood capillary?

• A lacteal begins blindly as a lymphatic channel
• A lacteal is an artery
• A lacteal is lined by stratified squamous epithelium
• A lacteal contains a thick cartilage wall

Q7. Which pathway correctly follows chyle after it leaves intestinal lacteals?

• Lacteals to portal vein to hepatic vein
• Lacteals to ureters to bladder
• Lacteals to bile canaliculi to gallbladder
• Lacteals to mesenteric lymphatics to lymph nodes to central trunks

Q8. Why does lymph draining the intestine appear more milky after a fat-containing meal?

• Increased red blood cells in lymph
• Increased calcium crystals
• Increased bile pigment secretion into lacteals
• Increased chylomicrons in intestinal lymph

Q9. Which part of the intestinal wall receives lymph from lacteals before drainage reaches mesenteric vessels?

• Renal collecting ducts
• Hepatic sinusoids
• Deeper intestinal lymphatic networks
• Pancreatic ducts

Q10. Which statement best contrasts portal and lymphatic nutrient transport?

• All nutrients enter only lymph
• Chylomicrons enter renal veins first
• Water-soluble nutrients mainly enter portal blood, while chylomicrons enter lymph
• All nutrients enter only the portal vein