"Inseparable Air" Water and air are important PPT courseware 2

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"Inseparable Air" Water and air are important PPT courseware 2

1. Animals cannot live without air

All living animals breathe and need air.

2. How do animals breathe?

Insects breathe through their trachea. This network of tracheae can reach all parts of the insect's body and communicate with the outside world through vents in the abdomen.

Many animals in the water use gills to breathe. The place where the shark's gills lead to the outside of the body, where the skin looks like a split, is called a gill cleft.

When frogs are small (called tadpoles) they live in water and breathe through their gills; when they grow into frogs, they breathe through their moist skin.

There are many tracheae in the bird's body, and many large sacs connected to the lungs, so the bird can fully breathe during flight.

Experience activity one:

First put your hands in front of your nose, face your nostrils with your palms, and feel your breathing. Then use the other methods you just thought of to feel your breathing.

Experience activity two:

Please hold your nose with your hands and see how long you can hold on? If you can't hold on, don't hold on.

Experience activity three:

Put your hands on your chest, take a deep breath, and then slowly exhale. Repeat this several times and feel the changes in your chest and abdomen when you inhale and exhale.

think:

Based on the changes in the chest and abdomen during breathing, can you guess which organs in our body are involved in breathing?

The human respiratory organs consist of the nose, throat, trachea, bronchi and lungs. The lungs are the place where gases are exchanged and the other organs are the passages for gases - the respiratory tract. The lungs are divided into left lung and right lung. There are many alveoli in the lungs, with a total of 750 million. If the alveoli are expanded, the surface area can reach 55 square meters to 70 square meters. The surface of the alveoli is densely covered with a network of capillaries.

Information: If we breathe 20 times per minute and inhale 500 ml of air each time, how much air goes in and out of the body throughout the day and night?

3. For good health, protect the air

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"Inseparable Air" Water and air are important PPT courseware:

"Inseparable Air" Water and air are very important PPT courseware 1. Animals cannot live without air. All living animals must breathe and need air. Snake in hibernation, bear in hibernation, frog in hibernation... 2. How do animals breathe? Insects use trachea...

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Update Time: 2024-07-04

This template belongs to science courseware People's Education Press Third Grade Science Volume 1 industry PPT template

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