2.3 digestive organs

• Biologie
• Middelbare school
• havo, vwo
• Leerjaar 2

Start taks 'digestive organs'

1. copy the learning objectives to your zuidschrift
2. join this LessonUp
3. start reading: pages 104-107

learning objectives

• You can list the functions and characteristics of the parts of the digestive system
• You can list the digestive juices and their functions

Secret Student

This lesson, I have randomly picked someone to be the secret student.

I pay special attention to:

• Your use of English
• Your participation in the lesson

At the end I will reveal the secret student, If I can give them positive feedback, they also earn 1/3 +0,5 OR +1 cm² cheat sheet.

agenda

1. review nutrients + digestive system

2. reading + notes

3. asg. 1

4. lesson end

We'll do most assigment in the next lesson.

Wheel of homework

Go to Lessonup.app and use this code

Reward

Penalty

Rewards

• +1 cm2 cheatsheet = you get to make a cheatsheet for a test. This starts being 1 by 1 cm. Everytime you earn this it gets 1 cm bigger to a max of 4 by 4 cm.
• 1/3 +0.5 = If you earn this 3 times you get to add 0,5 to one of your biology marks.
• Snitch = You can pick a classmate who also is checked for homework, you earn two V's (having 3 earns you a 1/3 +0,5)
• Too bad = You only get one V
  

penalties

• 45 min extra worktime = you need to come after school and do homework, this will last for 45 min or until the task is done
• Coloringpage = You get to pick a coloringpage, You need to color it and perform tasks that might be on it. You need to hand it in during the next lesson, If you don't you get 2 marks.
• 2/1 marks = a mark is an X, if you get 3 of these you will automaticly earn the 45 min extra worktime.
• Snitch = You can pick a classmate who also is checked for homework
• Lucky! = You don't get a penalty

What function can be performed by all nutrients?

1. Building material
2. Fuel
3. Reserve
4. Protective substance

What is the main function of a protein?

1. Building material
2. Fuel
3. Reserve
4. Protective substance

What is the main function of a carbohydrate?

1. Building material
2. Fuel
3. Reserve
4. Protective substance

What organ lets food actually enter your body? (into the bloodstream)?

duodenum

stomach

oral cavity

salivary gland

gall bladder

Liver

tongue

oesophagus

caecum

large intestine

small intestine

rectum

duodenum

Anus

pancreas

a short journey

• 4 steps:

Mouth/throat

Stomach

Duodenum

Small/large intestine

Oral cavity

• Start of digestion:
• Salivary glands produce saliva
• Saliva begins the digestion of starch (carbohydrates)

Enzymes

Mouth and throat cavity - swallowing

During swallowing, the uvula closes off the nasal passage, and the epiglottis closes off the windpipe.

oesophagus

• The oesophagus pushes food down using peristaltic movements.
• The food then enters the stomach.

stomach

stomach

• Gastric glands produce gastric juice (water, hydrochloric acid, enzyme)
  
• Hydrochloric acid kills bacteria
• enzyme digests proteins
• Temporary storage place
• The pyloric sphincter allows only small amounts through at a time

Which foods contain a lot of protein again?

1. chicken
2. bread
3. apple
4. carrot

Duodenum

= a section of the intestine where pancreatic juice and bile are released.

Duodenum

Here, strong digestive juices are added:

• Liver → produces bile (stored in the gallbladder) → emulsifies fats
  
• Pancreas → produces pancreatic juice → digests everything!
  

The function of bile

Fat does not dissolve in water

Bile emulsifies fats

Which digestive juice does the liver produce?

1. Intestinal juice
2. pancreatic juice
3. saliva
4. bile

Which digestive juice does the oesophagus produce?

1. saliva
2. stomach juice
3. bile
4. none

The digestion of proteins in your food takes place in your...

1. mouth
2. mouth and oesophagus
3. mouth and stomach
4. mouth, duodenum and stomach

True or false?
One function of stomach acid is to kill bacteria.

1. tue
2. false

True or false?
Bile digests fats.

1. true
2. false

Pancreatic juice digests..

1. proteins
2. fats
3. carbohydrates
4. all three

saliva digests...

1. proteins
2. fats
3. carbohydrates
4. all three

What is the name of the organ where all the water is absorbed from the food pulp?

1. small intestine
2. appendix
3. large intestine
4. duodenum

Which digestive juice does the small intestine produce?

1. Intestinal juice
2. stomach juice
3. bile
4. none

Intestinal juice digests

1. protein
2. fats
3. carbohydrated
4. all three

Welke darm heeft geen functie in je lichaam?

1. Dikke darm
2. Dunne darm
3. Blinde darm
4. Slokdarm

notes

Oral cavity: producing saliva with an enzyme for digesting starch.

Oesophagus: moving the lump of food from the oral cavity to the stomach.

Stomach: gastric juice with an enzyme for partially digesting protein; producing hydrochloric

acid to kill bacteria.

Liver: producing bile to emulsify fats; bile is stored in the gall bladder.

Pancreas: producing pancreatic juice with enzymes to digest proteins, carbohydrates and fats.

notes

Duodenum: mixing bile and pancreatic juices with the chyme (food pulp).

Small intestine: absorbing nutrients, digestion products and water into the blood. Large surface area due to intestinal folds and villi. Produces intestinal juice with enzymes to complete the digestion of proteins and carbohydrates.

Large intestine: removing water from the pulp of undigested food residues; water is absorbed into the blood.

Rectum: collecting and providing temporary storage for undigested food residues (faeces).

Digesting food

• Mouth: chewing and saliva

                        Saliva: digests starch (type of carbohydrate)

• Stomach: kneads and mixes food with digestive juices, gastric juice

                        Gastric juice: Kills bacteria and digests proteins

• Duodenum: bile en pancreatic juice

                        Bile : emulsifies fats

                        Pancreatic juice: digests proteins, carbohydrates and fats

• Small intestine: intestinal juices

                        Intestinal juices: digests proteins and carbohydrates

digestive organs

• Liver: produces bile to emulsify fats
• Gall bladder: stores bile
• Pancreas: producies pancreatic juice

• Small intestine: absorption of nutrients
• Large intestine: removing water from the pulp of undigested food residues
• Rectum: temporary storage for undigested food residues (faeces)

What you should do: 

• do asg. 1

Done with the above?

• check online material in Google Classroom
  
• Make other homework
• Read a book

Working in Silence

• No asking questions
• Silent, don't disturb anyone

Mouth

Stomach

Duodenum

Small intestines

Carbohydrates

Carbohydrates

Carbohydrates

Proteins

Proteins

Proteins

Fats

Digestion doesn't happen in all parts of the intestinal tract. Where does it NOT happen?

1. Stomach
2. Duodenum
3. Small intestine
4. Large intestine

In which of these organs is food taken in?

1. stomach
2. duodenum
3. small intestine
4. large intestine

Tidy Duty

3 people each lesson

• Desks: empty and straight
• Chairs:  underneath the desks OR end of day: on the desks
• Floor: no rubbish