AP Biology Help » Systems Physiology » Digestive System » Digestive Physiology » Understanding Emulsification

A patient is admitted to the hospital with serious abdominal pain. A scan reveals that the gall bladder has multiple stones in it, and one is blocking the cystic duct.

You are watching: Is bile an emulsifier


Explanation:

The gall bladder is necessary because of its storage and release of bile during digestion. Bile is necessary in the emulsification (or breaking up) of nonpolar fats in the aqueous tiny intestinal fluid. Cystic duct obstruction would certainly result in bile being unable to reach the tiny intestine, and triglycerides would be unable to be correctly emulsified and soaked up.


Explanation:

The liver produces bile, which travels dvery own the bile duct to be released right into the tiny intestine, particularly the duodenum. When the duct is not open up, bile backs up and gets stored in the gall bladder. Once the duct is open, once the tiny intestine senses the presence of food, the gall bladder will release the bile to emulsify fats during digestion.


Explanation:

Both bile salts and phospholipids are excreted from the bile duct into the top small intestine (duodenum) to emulsify lipids. They are both amphipathic molecules, which means they have non-polar/lipophilic ends that deserve to bind to lipids and polar/hydrophilic ends that can bind to water, hence emulsifying the lipids that they contact.

As these compounds are excreted from a single duct, tiny intestine motility allows them to mix through the contents of the little intestine and emulsify even more lipids than they would have the ability to in a still environment. Small intestine motility additionally helps to break up large globules of dietary fat.

Once emulsified, dietary fat can be broken dvery own by lipase, however lipase itself does not improve emulsification.


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Example Concern #1 : Understanding Emulsification


Which organ stores the compound responsible for emulsifying lipids throughout digestion?


Possible Answers:

Liver


Pancreas


Gall bladder


Small intestine


Correct answer:

Gall bladder


Explanation:

Fats are mainly composed of nonpolar lipids, making them hydrophobic and also insoluble. In order to digest fats, they must be grouped together to rise their surchallenge area and also enable for enzyme interactivity, digestion, and absorption.

Fat emulsification is the process of enhancing the surconfront area of fats in the small intestine by grouping them into small clusters. This is the obligation of bile, a liquid created by the liver and stored in the gallbladder. Actual digestion of the fats is then completed by lipase, an enzyme from the pancreas. Digested lipids are then transported into the lacteals of the microvilli for transport through the lymphatic mechanism before entering the blood.


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Example Inquiry #1 : Understanding Emulsification


Bile is produced in the __________, stored in the __________, and released right into the __________.


Possible Answers:

liver . . . gallbladder . . . little intestine


gallbladder . . . gallbladder . . . tiny intestine


kidneys . . . gallbladder . . . tiny intestine


liver . . . gallbladder . . . big intestine


Correct answer:

liver . . . gallbladder . . . tiny intestine


Explanation:

The liver is responsible for manufacturing bile salts; these salts are transferred into the gallbladder as bile. The gallbladder stores bile, which it then secretes right into the small intestine. Bile contributes to digestion by breaking up big fat globules, a process known as emulsification. Fats are insoluble in water, so emulsification provides pancreatic lipase through even more surface area on which to act. 

Neither the spleen nor the huge intestine are appropriate answers to this sentence. The large intestine helps rerelocate undigested waste from the body, absorbs water from waste, and also produces/absorbs vitamins (as a result of colonies of helpful bacteria that live in the huge intestine). The spleen is an organ responsible for filtering the blood and also housing white blood cells; it is not connected in digestion.


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Example Concern #2 : Understanding Emulsification


Bile salts are amphipathic and also crucial for fat absorption. Which of the following nutrients will be challenging to absorb in a patient via an incapacity to secrete bile salts into the stomach?

I. Vitamin A

II. Vitamin B

III. Vitamin C


Possible Answers:

I and also II


I only


I and also III


All of these


II only


Correct answer:

I only


Explanation:

Bile salt emulsifies fat into chylomicrons to enable for absorption. Of the selections, only vitamin A is fat-soluble. Vitamins B and C are both water-soluble.


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Example Question #1 : Understanding Emulsification


Bile salts emulsify dietary fats by breaking them down into smaller sized clusters and creating a molecule called a __________.


Possible Answers:

micelle


chylomicron


globule 


cluster


bolus


Correct answer:

micelle


Explanation:

Bile salts surround fat droplets in order to develop micelles. These micelles are more accessible to the enzymes that have the capability to break them dvery own additionally. Chylomicrons are lipoproteins that are important in move and metabolism of lipids.

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Example Question #8 : Understanding Emulsification


Bile salts make fat dropallows even more obtainable to the enzyme __________.


Possible Answers:

lingual lipase


chymotrypsin


trypsin


pepsin


pancreatic lipase


Correct answer:

pancreatic lipase


Explanation:

Once big fat clusters are damaged dvery own by bile salts to become smaller micelles, pancreatic lipase has actually even more surchallenge location to access fats. The enzymes are able to reach the fat droplet through the gaps in between bile salts. Fats are not emulsified by bile yet in the mouth, so lingual lipase acts upstream of bile to hydrolize long chain hydrocarbons. The various other answer options are proteases. 


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