Topic b2b lesson 2 title enzymes and digestion
Download
1 / 14

Topic: B2b Lesson: 2 Title: Enzymes and digestion - PowerPoint PPT Presentation


  • 194 Views
  • Uploaded on

Topic: B2b Lesson: 2 Title: Enzymes and digestion. Aims: Explain how enzymes are involved in digestion Starter: Write down everything you can remember from key stage 3 about digestion, eg. what it is; where it takes place. What is digestion?

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Topic: B2b Lesson: 2 Title: Enzymes and digestion' - Anita


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
Topic b2b lesson 2 title enzymes and digestion l.jpg

Topic: B2bLesson: 2Title: Enzymes and digestion

Aims: Explain how enzymes are involved in digestion

Starter: Write down everything you can remember from key stage 3 about digestion, eg. what it is; where it takes place...


Slide2 l.jpg

What is digestion?

Breaking down large, insoluble molecules into smaller, soluble molecules that can be absorbed through the wall of the small intestine

What breaks down the large molecules?

Digestive enzymes made by specialised cells inside glands


The enzymes involved l.jpg
The enzymes involved...

  • Carbohydrates Simple sugars

  • Proteins Amino acids

  • Lipids (fats) Fatty acids + glycerol


Slide4 l.jpg

Digestion animation (First 5 mins 15 secs)

Listen carefully and make notes in your book. You will be quizzed after the animation so listen!


Mini test on digestive enzymes l.jpg
Mini test on digestive enzymes...

  • Where are the following digested:

  • Carbohydrates mouth and small intestine

  • Proteins stomach and small intestine

  • Fats small intestine

    2. What are the following broken down into by digestive enzymes?

  • Carbohydrates  simple sugars

  • Proteins  amino acids

  • Fats  fatty acids + glycerol

    3. Where are most enzymes produced? Pancreas


Why do you think there is acid in the stomach l.jpg
Why do you think there is acid in the stomach?

  • Kills bacteria in food – protects us

  • Denatures proteins – makes digestion easier

  • Activates stomach enzymes – these only work in acidic conditions

  • Ever wondered why PEPSIN (stomach enzyme) doesn’t digest our own stomach?

  • Pepsin is inactive when first made and is only activated by HCL to start digesting proteins.


What does bile do l.jpg
What does bile do?

  • Bile is produced in the liver and stored in the gall bladder.

  • The enzymes in the small intestine need an alkaline pH to work best, so bile passes into the small intestine and neutralises acid from the stomach.

  • Bile also emulsifies fat droplets to increase their surface area


How are villi in the small intestine adapted to absorb food l.jpg
How are villi in the small intestine adapted to absorb food?


Slide10 l.jpg

  • How are villi specialised to carry out their job of absorbing digested foods?


Answers l.jpg
Answers

  • Millions provide large surface area

  • Each villus has many microvilli to further increase surface area

  • Rich blood supply for absorbed nutrients to pass into and be taken around body

  • Branch of lymphatic system takes absorbed fatty acids and glycerol away to be used or stored

  • Villi wall one cell thick for rapid passing through of nutrients


Digestive system summary l.jpg
Digestive system summary

  • Salivary glands produce ________

  • Liver produces ______

  • Stomach produces ________ + ________

  • Gall bladder stores ________

  • Pancreas and small intestine both produce ________, ________, and ________



Slide14 l.jpg

This powerpoint was kindly donated to www.worldofteaching.com

http://www.worldofteaching.com is home to over a thousand powerpoints submitted by teachers. This is a completely free site and requires no registration. Please visit and I hope it will help in your teaching.


ad