BIO265 8.2 Digestion

With regard to protein absorption in the small intestine, which statement/s is/are correct: 1 - Some intact protein can be absorbed 2 - Sodium is directly involved in the absorption of amino acids 3 - Pepsin is the most important protease for protein digestion 4 - Single amino acids enter intestinal cells through the GLUT 5 receptor 5 - Pancreatic amylase is essential for protein digestion 6 - The stomach is the MOST important organ for carbohydrate digestion

1,2

Arrange the following events in the correct order: (1) absorption of lipids (2) emulsification (3) micelle formation (4) digestion of lipids by pancreatic lipases

2,3,4,1

Which of the following would be MOST important for digestion of fat?

Gallbladder and bile

Which of the following events occurs because of the low pH of the stomach?

Pepsin can become activated

Enzymes for the digestion of disaccharides are produced in the

Small intestine

Amino acids and monosaccharides are absorbed in the ____________, and fatty acids are absorbed in the _______________.

Small intestine; small intestine too

Why are several digestive enzymes secreted as zymogens?

So they act only in the lumen and do not digest the tissues that secrete them

SGLT, a transport pump of the small intestine, can only absorb glucose by simultaneously transporting

Sodium

__________ is secreted from the ____________ and acts in the digestion of proteins and the activation of other digestive enzymes.

Trypsinogen, pancreas

Pepsin would have the greatest activity

When the pH of the chyme is less than 3

When protein is broken down the end result is

amino acids

micelles

are small droplets of lipids surrounded by bile salts

Bacteria in the colon carry out all of the following EXCEPT...

digest most of the proteins we get in the diet (they DO synthesize vitamin K, produce some of the gases found in flatus, digest cellulose, and form part of the feces)

Most nutrient absorption occurs in the

duodenum and the rest of the small intestine

Trypsin is activated by the enzyme

enterokinase

Which of these is not a component of the pancreatic juice?

enterokinase

Which of these lipoprotein molecules transports excess lipids from cells back to the liver?

high-density lipoprotein (HDL)

emulsification

increases surface area for lipid digestion.

Lipid digestion and absorption requires the coordinated actions of _____ and _____.

lipase and bile

The chemical digestive process of proteins begins in the

stomach