CH3.4 Organizing digestion

• Biologie
• Middelbare school
• havo, vwo
• Leerjaar 3

Let's repeat 3.3!

What is the difference between mechanical and chemical digestion?

Digestion is

1. Making nutrients smaller
2. Making poop out of food
3. Making food smaller
4. Changing food into something we cannot use

Ingestion

Mechanical digestion

Chemical digestion

MOVING THE FOOD INTO YOUR MOUTH

BREAKING THE FOOD INTO SMALLER PIECES.

THIS IS DONE BY YOUR TEETH

BREAKING THE FOOD INTO EVEN SMALLER PIECES.

USING ENZYMES TO BREAK DOWN THE FOOD MOLECULES. 

What is the name of the enzymes in your stomach that break down proteins?

What is the end product matching the enzyme called 'protease'?

1. Amino acids
2. Protein
3. Fatty acids
4. Nutrients

Why are there no enzymes that break down water, vitamins and minerals?

What is the end product matching the enzyme called 'protease'?

1. Amino acids
2. Protein
3. Fatty acids
4. Nutrients

Which of the following processes does not take place in the small intestine?

1. Ingestion
2. Chemical digestion
3. Mechenical digestion
4. Absorption

Enzymes are ...

1. carbohydrates
2. proteins
3. lipids / fats
4. vitamins / minerals

Which enzyme breaks down fat?

1. amylase
2. lipase
3. fatty acid and glycerol
4. protease

3.4 Organising digestion

Goals

Goals:

What are the organs and their functions of the digestive system?

What is peristalsis, digestion and emulsification?

Which digestive juices does our body produce and what do they do?

Oesophagus and peristalsis

The stomach

Gastric juices:

Enzymes to break down protein (proteases e.g. pepsin)

Gastric acid:

Destroys bacteria

Mucosal layer inside stomach (why?)

Acidity and enzymes

The duodenum

Bile

Pancreatic juice

Bile and emulsification

Increasing the surface area:

Emulsification

The small intestine

Intestinal juices

Villi

Hepatic portal vein

The large intestines and rectum

Absorption of water

Indigestible waste --> faeces

What is peristalsis?

salivary glands

pancreas

small intestine

duodenum

large intestine

esophagus

liver

stomach

Which of the following processes does not take place in the small intestine?

1. Ingestion
2. Chemical digestion
3. Mechenical digestion
4. Absorption

1. Bile (gal) contains enzymes.
2. Pancreatic juice contains enzymes.

1. Both are true
2. Both are false
3. Only 1 is true
4. Only 2 is true

muscular motion caused by circular muscles in the digestive tract to transport food

acidic digestive juice made by the stomach to break down proteins and to kill bacteria. It contains water, enzymes and gastric acid.

splitting up fat molecules by adding bile

finger-like structures at the inner lining of the small intestine

peristalsis

gastric juice

emulsification

villi

Fibre is not digested by your body. Ellen and Karim discuss why this is so. Ellen says that fibre is small enough to enter your bloodstream. Karim says that fibre is unused material and it is just eliminated. Who is right?

1. Ellen
2. Karim
3. Both
4. Neither

Which of the following digestive juices kills bacteria in the stomach?

1. Bile
2. Gastric acid
3. Pancreatic juice
4. Gastric juice

Where is bile stored?

What is the function of the Liver?

1. To produce saliva
2. To produce bile
3. To produce pancreatic juice
4. Temporary storage of the food

What is NO function of the stomach?

1. Mixing the food
2. Killing germs
3. Adding saliva
4. Digesting proteins

Which enzyme is produced by the salivary glands in the mouth?

1. amylase
2. renin
3. protease
4. lipase