lesson 15 stomach and intestines

Marie Jaja T. Roa- Santa Maria West Central School- Schools Division of Ilocos Sur

Lesson 15

Stomach and Intestines


What have you eaten today? Why did you choose to eat those foods? What will happen if we do not eat for a day?


What do you think will happen to the food you have eaten as it gets inside your mouth?

Are the food you have eaten directly get inside the different parts of your body?

Today, you are going to learn, how is food digested in the stomach and intestine.


Divide the class into groups.Do the following activity:

Activity 1: How is food digested in the stomach? Day 2: Activity 2: How is food digested in the intestine?


Activity 1: “How is food digested in the stomach?”

What you need:

Small pieces of biscuits Ziplock a glass of water 2 tbsp. of flour any small pieces of food available



What to do: Put the water in a clean ziplock. Add broken pieces of biscuits. Add flour. Add the small pieces of any food available. Shake the resealable plastic bag. Shake

until all are mixed well.



Guide Questions: What happened to the biscuits, flour and other food after

shaking the ziplock bag? The stomach is similar to the bag in your activity. How are

they similar? Will the food stay in the stomach for a long time? What will happen to the food? What happens after the food is broken down into small

pieces?


Digestion in Stomach


Digestion in Stomach

The food we eat gives us energy to work and play.


Without food, the other parts of the body like bone and muscles and the internal organs do not have energy to function.


However, before our body can make use of any food that is eaten, it must be broken down into liquid form or into smaller nutrients. The process by which food is broken down into nutrients is called digestion.

Digestion takes place as soon as we start to chew our food.


The tongue, lips and cheeks move the food between the teeth to break it down into small pieces.

Saliva from the salivary glands mixes with the food to soften it.

Saliva also kills bacteria and breaks down starches into sugars.

So digestion of starches starts in the mouth.


Moist chewed food from the mouth goes down to stomach.

The stomach is a large organ that is lined with layers of muscles.


In the stomach, food is broken down into smaller particles.


As the muscles contract and relax, food in the stomach is squeeze, twisted and churned.

While food is being physically changed in the stomach, digestive enzymes and juices are also combined to change it into nutrients.


The mechanical part breaks down food into small bits by the chewing of food in the mouth and squeezing of food particles in the stomach.

The chemical part of digestion is the mixing of food particles with chemicals in the saliva and stomach which change it into nutrients that can be absorbed by the body.

The process of digestion is BOTH mechanical and chemical.


Food stays in the stomach for four hours until the food turns into a thick liquid.

The food that has been moistened, chewed in the mouth and mixed with chemicals or enzyme in the stomach goes into your small intestine.


Divide the class into groups.Do the following activity:

Day 2: Activity 2: How is food digested in the intestine?


Activity 2: “How is food digested in the intestine?”

What you need:

Black pepper Chili powder A glass of water



What to do: Mix black pepper and chili powder

in a cup with water. Pour the mixture through paper

towel into another cup.



Guide Questions: What went through the paper towel? This event occurs I our intestines. Describe the materials

that went though the paper towel. What will happen to the liquid material? What will happen to those that did not went through the

paper towel? Which organ is similar to the paper towel?


Digestion in Intestine


The small intestine is about 2.5 cm wide and 7m long coiled tube where food is finally digested and absorbed.


The walls of the small intestine are made of muscles that squeeze food and continuously move it.

It contains digestive juices and other enzymes that help break the food into nutrients.The nutrients are then absorbed by the small intestines then go into your blood stream.The blood carries these nutrients to the different parts of the body.


Video- Process of Digestion

https://www.youtube.com/watch?v=VwrsL-lCZYoBy kidshealth.org

https://www.youtube.com/watch?v=VwrsL-lCZYo

https://www.youtube.com/watch?v=VwrsL-lCZYo

lesson 15 stomach and intestines

Education