3.4 Accessory Digestive Structures

Question 1

What do the liver, gallbladder, and pancreas do for the small intestine?

Answer 1

Secretes material into the duodenum

Question 2

What is an exocrine function?

Answer 2

Digestive tract related function

Question 3

What is in pancreatic juice?

Answer 3

• Digestive enzymes: amylase, lipase, proteases

- Bicarbonate: neutralizes chyme

Question 4

Bicarbonate is an important buffer. What is a buffer?

Answer 4

Something that helps keep pH at a desirable level

Question 5

What does the liver make?

Answer 5

The liver creates bile

Question 6

What does the gallbladder do in relation to bile?

Answer 6

It stores and secretes bile as needed

Question 7

What is bile?

Answer 7

A lipid emulsifier that breaks larger lipid globules into smaller ones and allows them to be suspended in a watery environment

Question 8

How are lipids emulsified in the small intestine?

Answer 8

• Large lipid globules that are too large for lipase to act on enter the small intestine
• Bile is released from the liver and gall bladder into the small intestine
• Bile salts have hydrophobic tails and hydrophilic heads. The tail attach to lipid and head face the watery lumen
• The arrangement of bile salts and intestinal movement causes lipids to break down into micelles
• Micelles can be suspended within water and allow for lipase to act on it.