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DEFINITION OF CELLS
After Hooke discovered the small rooms in a sliced cork and applied the name “cell” in 1676, Antonie
Van Leeuwenhoek invented additional lenses to study smaller organisms. He named these smaller organisms
as microorganisms. Later, Matthias Jakob Schleiden and Theodor Schwann stated that “cells are the basic
unit of organisms.” The knowledge about cells has been expanded ever since. What are some of the cells
you are familiar with, what are their characteristics and can they be seen without a microscope and how?
What are the characteristics
of each type of cells?
1.1 Characteristics of Cells
Equipment 9 illustration of cells
Instructions Each group of students classifies the following cells and records their results in
their notebooks.
Red Blood Cells Human Cheek Euglena Cell
in Human Bodies Epithelial Cells from Fish Ponds
Guard Cells Paramecium Chicken Egg Cell Human Sperm
Human Neuron Human Muscle
Figure 1.6 Different types of cells
12 Science Solution Mathayomsuksa 1
