IB Absorption SL

What is absorption?

• Food entering the mouth and being chewed

• Food entering the stomach for digestion

• Taking digested food into the blood stream

• Making complex organic molecules in cells using digested foods

Where is the most water absorbed in the human digestive system?

• stomach

• liver

• small intestine

• large intestine

What is the main function of the large intestine?

• Absorption of water

• Digestion of fats and proteins

• Absorption of nutrients

• Recycling of digestive enzymes

Which of the following structures increase the surface area for absorption of digested food in the small intestine?

I. Microvilli

II. Protein pumps

III. Villi

• I only

• I and III only

• II and III only

• I, II and III

Which of the following structures help the absorption of food by the small intestine?

I. Capillary networks

II. Villi

III. Microvilli

IV. Membrane proteins

• I and II only

• II and III only

• II, III and IV only

• I, II, III and IV

Celiac disease causes the destruction of the villi cells.

Which of the following is most likely to happen to people with celiac disease?

• Incomplete digestion of fats

• Poor absorption of calcium

• Increased levels of glucose in blood

• Damage in the esophagus caused by increase in acid content of the stomach

Which of the following is/are true of the small intestine?

I. Circular muscles contract to move food forward

II. Longitudinal muscles contract to stop food going backwards

III. Circular muscles are closer to the lumen than longitudinal muscles

• I only

• I and II only

• III only

• I, II and III

Which of the following is/are true of the small intestine?

I. Lacteals transport digested fats

II. Goblet cells produce mucus

III. Nutrients are absorbed across epithelial cells

• I only

• I and II only

• III only

• I, II and III

By what method of transport are fatty acids and monoglycerides absorbed across the plasma membrane?

• endocytosis

• simple diffusion

• facilitated diffusion

• active transport

By what method of transport are triglycerides and cholesterol absorbed across the plasma membrane?

• endocytosis

• simple diffusion

• facilitated diffusion

• active transport