Class 4 - Science - Chapter 10 - How Our Body Works

How Our Body Works

Welcome to an exciting journey inside the human body! Today, we'll explore how our digestive system processes food, the structure and care of our teeth, and how the respiratory system helps us breathe. Get ready for some fun activities, fill-in-the-blanks, true or false questions, and a Q&A session!

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Class 4 - Science - Chapter 10 - How Our Body Works

Ancient Lotus School, India (Demo School)114 views · Feb 22, 2024

The Digestive System

The Journey of Food:

1. Food starts its journey in the mouth, where it is chewed and mixed with saliva.
2. It then travels down the esophagus and into the stomach, where it's broken down by stomach acids.
3. The small intestine absorbs nutrients from the food.
4. Finally, the large intestine absorbs water, and the waste is expelled.

Fill in the Blanks:

1. The stomach uses _______ to help digest food. 
2. Nutrients from food are absorbed in the _______ intestine.

True or False:

1. The liver is part of the digestive system. (True)
2. Food is digested in the large intestine. (False)

Fun Activity: Pretend you're a piece of food. Write a diary entry about your journey through the digestive system!

Teeth - Structure and Care

Understanding Teeth:

1. Our teeth help us to chew food. 
2. A tooth consists of enamel, dentin, and pulp.

Caring for Your Teeth

1. Brush your teeth twice a day with fluoride toothpaste. 
2. Floss daily to remove food and plaque between teeth.
3. Eat healthy foods and limit sugary snacks.
4. Visit your dentist regularly for check-ups.

Fill in the Blanks:

1. The hardest substance in the human body is _______.
2. The inside of a tooth contains the _______.

True or False:

1. You should brush your teeth once a day. (False)
2. Flossing helps to clean between your teeth. (True)

Fun Activity: Show how to brush your teeth using a toothbrush and explain each step. Remember, no real toothpaste needed for the demonstration!

The Respiratory System

Breathing In and Out:

1. Air enters through the nose or mouth. 
2. It goes down the trachea and into the lungs.
3. In the lungs, oxygen is exchanged for carbon dioxide in the blood.
4. We exhale carbon dioxide.

Fill in the Blanks:

1. The muscle that helps us breathe is called the _______.
2. Oxygen enters the bloodstream in the _______ of the lungs.

True or False:

1. The heart is part of the respiratory system. (False)
2. We breathe out oxygen. (False)

Fun Activity: Let's do a breathing exercise! Inhale deeply through your nose, hold for 3 seconds, and exhale through your mouth. Feel your chest and belly move.

Questions and Answers

Q. What is the role of the stomach in digestion?

Answer: The stomach breaks down food with its acids and enzymes, turning it into a liquid or paste.

Q: Why is dental care important?

Ans: Proper dental care prevents cavities, gum disease, and keeps our teeth healthy for chewing food.

Q: How do the lungs work?

Ans: The lungs exchange oxygen from the air we breathe in for carbon dioxide, a waste product, which we breathe out.

Congratulations on completing this tutorial! You've learned about the digestive, dental, and respiratory systems through fun and interactive ways. Keep exploring and asking questions about how your amazing body works!