The digestive system

• Biologie
• Middelbare school
• havo
• Leerjaar 2

Welcome!

Today:

Nutrition game

Explanation about digestive system (page 97)

Making exercises

What are we going to learn today?

Today we will be learning:

What the digestive system consist of.

What the function of your teeth are related to your digestion.

What perastaltic movements are. 

How your digestive juices break down food.

The digestive system

In your digestive system foods get, well, digested. This means:

- The good nutrients are taken in by your body. 

- The rest of the food gets removed from your body. 

Your teeth

The food you eat needs to go through your whole intestinal tract (about 15 meters!). So the food needs to get smooth, whole and wet. All that happens in your mouth. You chew it and your salivary glands add saliva. 

Your teeth

Besides that, by chewing your food you create more surface. This means more space for digestive juices to attach to and digest food more easily. This is a way of mechanical digestion. 

Perstaltic movement

Your food gets transported and kneaded by muscles that are in the walls of the digestive organs. That way your body makes sure the food goes the right way. This is done through peristaltic movements. 

Digestion

Your food gets digested mostly by digestive juices, which get made by digestive glands. Digestive juices are mostly water, with enzymes dissolved in it. Enzymes change the molecules of the nutrients by cutting them in pieces. That makes is easier to absorb it and use it. 

This is called chemical digestion. 

Digestive juices

Enzymes

Time to work!

The homework for next lesson are the exercises of paragraph 2.2, including the summary and plusexercises. 

Function of your teeth

The enzyme lipase is dissolved in your saliva. What does this make saliva?

1. Digestive gland
2. Enzyme
3. Digestive juice
4. Digestive substance

People often say it's healthier to chew thoroughly on your food. Why is that? Name 2 reasons.

Saliva is a digestive juice that mostly digests nutrients that are high in energy. Do they digest protein?

1. Sure
2. No way

Statement: In every digestive juice are the same enzymes because they all digest food.

1. True
2. False