Intermediate Lacteals (Intestinal Lymph Capillaries) Quiz

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

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

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

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

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

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

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

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

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

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

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 contains a thick cartilage wall
• A lacteal is lined by stratified squamous epithelium

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

• Lacteals to ureters to bladder
• Lacteals to bile canaliculi to gallbladder
• Lacteals to portal vein to hepatic vein
• 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 chylomicrons in intestinal lymph
• Increased bile pigment secretion into lacteals
• Increased calcium crystals

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

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

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

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