6529 Lecture Notes - Lecture 6: Pancreatic Juice, Gastric Acid, Common Hepatic Artery

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rosesnake130

19 Jun 2018

School

University of Canberra

Department

University of Canberra

Course

6529

Professor

Disa Smee

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Gastrointestinal System Continued

1. describe the composition and functions of saliva

2. name the cell types responsible for secreting the various components of gastric juice and

indicate the importance of each component in stomach activity

3 phases of stimulatory and

inhibitory events

Cephalic

(reflex) phase

– your brain,

sight of food

will stimulate

receptors in

nervous

system. It can

be turned off with loss of appetite or depression.

Gastric phase – stuff that happens in stomach. When food is in the stomach, it uses

stretch receptors and uses nerves and hormones.

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Intestinal phase – stuff in intestines, is a brief stimulate effect as partially digested food

will enter the duodenum. We let a little bit in then shut it. Under neural and hormonal

control.

3. describe the role of the accessory organs and their secretions in digestion

Liver = is the largest gland in the body. Have 4 lobes

-Is made up of hepatocytes cells and they sit in a series of plates radiating out of a vein.

- Portal triads consist of – bile duct, hepatic artery

Functions of liver

- Helps to regulate blood glucose levels

- Synthesise and storage of amino acids , proteins , vitamins and fats

- Detoxify your blood.

- Bile drainage and also produces bile. Bile is a yellow green solution that is a detergent

that breaks down big chunks of fat so that enzymes can then do its job.

Pancreas = made up of tail, body and head and lies deep to the greater curvature of the

stomach.

Has an exocrine function and endocrine function

Exocrine = secrets alkaline pancreatic juice – it is super important!! Alkaline helps to bring

up acidity and the pancreatic juice holds lots of digestive enzymes.

Endocrine = release of insulin and glucagon – helps us to regulate blood sugar levels.

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Inside is made up of acidic which contain zymogen granules

which old the digestive enzymes

Gallbladder= the liver will produced bile which will then travel

to the gall balder were it will be stored.

- The gall bladder is a green muscular sac

Regulation of pancreas secretion

Need to regulate enzymes pumping into stomach.

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Document Summary

1. describe the composition and functions of saliva. 2. name the cell types responsible for secreting the various components of gastric juice and indicate the importance of each component in stomach activity. Your brain, sight of food will stimulate receptors in nervous system. It can be turned off with loss of appetite or depression. Gastric phase stuff that happens in stomach. When food is in the stomach, it uses stretch receptors and uses nerves and hormones. Intestinal phase stuff in intestines, is a brief stimulate effect as partially digested food will enter the duodenum. We let a little bit in then shut it. Under neural and hormonal control: describe the role of the accessory organs and their secretions in digestion. Liver = is the largest gland in the body. Is made up of hepatocytes cells and they sit in a series of plates radiating out of a vein. Portal triads consist of bile duct, hepatic artery.

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6529 Lecture Notes - Lecture 6: Pancreatic Juice, Gastric Acid, Common Hepatic Artery

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