"Unlocking the Secrets of Biological Structure" PPT

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Hunan Education Edition fifth grade science volume 2, unlocking the secrets of the structure of living organisms PPT

Part One: Use of Microscope

From seeds to towering trees, from cubs to adults, organisms are constantly growing. Why do organisms grow? Many people throughout history have wanted to uncover the secrets, but have been unable to do so because they could not see the subtle structures of plants.

In 1665, British scientist Robert Hooke made the first observation using a microscope. From this, humans discovered that plants are composed of cells and revealed the secrets of the structure of living organisms. What's going on? Let's go into the world of microscopes and find out!

Microscope use

Get to know the microscope

Use a microscope

Uncovering the secrets of the structure of living organisms PPT, Part 2: How to use and correct operating steps

Summarize the use of microscopes and correct operating procedures

1. Taking the mirror and placing it

Hold the mirror arm with your right hand and support the mirror base with your left hand

Place the microscope about 5 cm away from the edge of the experimental table, slightly to the left, and install the eyepieces.

2. Aiming at the light

Turn the converter to align the low-magnification objective lens with the light hole (be careful not to pull the objective lens with your hands!)

Aim the largest aperture at the light aperture, look at the eyepiece with your left eye, open your right eye, and use both hands to rotate the reflector at the same time to reflect the light into the lens barrel through the light aperture. Until the entire field of vision turns snow white

Give it a try:

1. Compare the differences between the two sides of the reflector

2. Switch the different apertures on the shutter and see the changes in the brightness of the field of view.

Nerve cells, also known as neurons. The basic function of neurons is to realize the reception, conduction and exchange of information by receiving, integrating, conducting and outputting information.

Epithelial cells are protective cells. The lining of our mouth, stomach, and intestines are all epithelial cells.

Muscle cells can use the energy produced by decomposing organic matter to contract and relax, thereby causing the body to move. It can be said that almost all animal organs that can move can move because they have muscle cells in them.

Synthesis--Synthesis of coagulation factors and serum albumin, as well as various digestive enzymes and the main components of bile

PPT to unlock the secrets of the structure of living organisms, part three: restoration and replacement

4. Restore and put back

1. After observation, first lift the lens barrel and remove the slide specimen

2. Wipe the surface of the microscope clean with gauze.

3. Turn the converter so that the two objective lenses extend forward and slowly lower the lens barrel to the minimum.

4. Place the reflector in an upright position

5. Put the microscope back to its original position

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"Unlocking the Secrets of the Structure of Biological Organisms" PPT download:

Hunan Education Edition fifth grade science, volume 2, unlocking the secrets of the structure of living organisms PPT download, the first part of the content: Learning to use a microscope in the first lesson, learning to use a microscope 1. The main development history and types of microscopes 1. The main development history: fleas Mirror (before 1600) Luo...

"Unlocking the Secrets of the Structure of Biological Organisms" PPT courseware:

Hunan Education Edition fifth grade science volume 2, PPT courseware to unlock the secrets of the structure of living organisms, the first part of the content: usage methods and operating steps Robert Hooke: British naturalist and inventor. In terms of physical research, he proposed the basic laws describing the elasticity of materials Hooke..

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Update Time: 2024-09-13

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