11 Bio Specialised Exchange Surfaces Quiz

Why do multicellular organisms need specialised exchange surfaces?

• Diffusion is fast enough to transport substances efficiently

• They have fewer metabolic demands compared to unicellular organisms

• Cells can store large amounts of nutrients without the need for constant exchange

• Diffusion alone is too slow for large organisms to get the necessary nutrients

What is the primary function of villi in the small intestine?

• To produce digestive enzymes that break down food

• To provide structural support for the intestinal lining

• To increase surface area for nutrient absorption

• To trap harmful bacteria and prevent infections

Which structural feature of villi allows lipids to be absorbed into the lymphatic system?

• Capillaries

• Lacteals

• Microvilli

• Goblet cells

Why do capillaries in the villi have a dense network?

• To store extra nutrients for later use

• To rapidly transport absorbed nutrients and maintain concentration gradients

• To prevent the absorption of harmful substances

• To slow down blood flow and prevent excessive nutrient loss

Which of the following is not a feature of villi that increases absorption efficiency?

• Single-layer epithelium

• High surface area

• Thick muscular walls for increased strength

• Rich blood supply

How do glucose and amino acids move across the villi into the capillaries?

• Only by diffusion

• By diffusion and active transport

• Through osmosis

• By facilitated diffusion only

What is the role of membrane proteins in the villi?

• To increase the number of cells in the intestinal lining

• To facilitate the transport of large, polar molecules across the epithelial cells

• To store nutrients temporarily before absorption

• To prevent harmful substances from being absorbed

Which part of the small intestine is the main site of nutrient absorption?

• Duodenum

• Jejunum

• Ileum

• Large intestine

Why is the blood flow in capillaries slow?

• To prevent blood clotting

• To provide more time for efficient exchange of nutrients and gases

• To allow white blood cells to patrol the intestines

• To maintain high blood pressure in the digestive system

What is the primary function of intestinal glands in the small intestine?

• To produce mucus and digestive enzymes

• To store absorbed nutrients

• To increase the surface area of villi

• To remove undigested waste