BIOL 67B Unit 4 Practice Exam

Which of the following is not a layer of the GI tract?

• Submucosa

• Muscularis

• Peritoneum

• Mucosa

What is the function of pepsin and HCI?

• Aiding in the breakdown of carbohydrates

• Facilitating the absorption of fats

• Inhibiting the activity of digestive enzymes

• Chemical digestion of proteins

The ultimate goal of digestion is to:

• Reduce ingested food to monomers of the major organic compounds for absorption

• Facilitate mechanical breakdown of food

• Eliminate waste products

• Control appetite and food intake

How are monosaccharides and free amino acids transported into epithelial cells of the small intestine?

• Na+/K+ pump

• Symport with Na+

• Antiport with Na+

• G-protein coupled receptor

How do chylomicrons enter the blood?

• They pass through the blood capillary walls since it is fenestrated

• They use a channel protein to enter the blood

• They enter lacteals to become part of the lymph, which eventually enters the blood

• Chylomicrons are lipid-soluble and cannot enter the blood

Chemical digestion of carbohydrates does NOT occur in the:

• Duodenum

• Mouth

• Small intestine

• Stomach

After being absorbed, monosaccharides and amino acids are transported into the liver hilus through the

• Gastric artery

• Hepatic portal vein

• Superior mesenteric vein

• Inferior mesenteric artery

Cholecystokinin (CCK) stimulates the release of what from the gallbladder and liver?

• Insulin

• Glucagon

• Bile

• Digestive enzymes

What is the most likely consequence of a blockage in the common bile duct?

• Reduced fat digestion and absorption

• Reduced carbohydrate digestion and absorption

• Reduced protein digestion and absorption

• Reduced water and electrolyte absorption

Which of the following is NOT a digestive enzyme produced by the pancreas?

• Trypsinogen

• Amylase

• Lipase

• Pepsinogen