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"Observe the living world around you with a microscope (2)" Tiny World PPT
Part One: Observation of Biological Cells
Small information
After Robert Hooke first discovered "cells", many scholars observed and studied plant stems, buds, fruits, as well as animal blood and lower animals under microscopes, and found that they all had the cells described by Hooke. structure. With the improvement of microscope manufacturing technology, people's research on cells has become more and more extensive and in-depth. A large number of research facts have shown that living organisms are composed of cells.
The establishment of the cell theory is hailed as one of the three major discoveries in natural science in the 19th century.
Use a microscope to observe the living world around you PPT, Part 2: The role of cells
What is the significance of cells to living organisms?
Check out relevant information and organize what you learned about the functions of cells into a network diagram.
Red blood cells in the blood transport inhaled oxygen and produced carbon dioxide;
Nerve cells have the function of conducting excitation;
Lymphocytes play an immune role;
The mesophyll cells of plants can perform photosynthesis to synthesize organic matter;
Phagocytes in body fluids have the function of destroying antigens;
Muscle cells have a role in movement;
Stem cells have the function of differentiating into new cells;
Epidermal cells play a role in tissue protection;
Retinal cells are photosensitive.
Use a microscope to observe the living world around you PPT, Part 3: Class Summary
After studying this lesson, what do you know about cells?
All living organisms are composed of cells. Cells have various shapes and have different functions.
Cells are the most basic structural unit of organisms and the most basic functional units of organisms.
Life activities such as respiration, digestion, excretion, growth, development, reproduction, heredity and other biological activities are all carried out through cells.
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