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History of the cell
For a long time, no one knew that plants and animals were made of. ... This led to the cell theory. ... Today, very powerful microscopes are used to learn even more about the cell. The cell has proven to be very complex.
What is a cell? ... Tissues group together to form an organ. An organ is made of groups of the same kind of tissues that work together to do a certain job. ... Some living things, such as bacteria, have only one cell. ... You can think of a cell as the basic unit of life. ... When the orange was cut, the cell walls were broken, and so the juice ran out. ...
What is a cell made of? ... This cell membrane holds all the cell material inside it. The membrane also lets food, oxygen, water, and wastes flow in and out of the cell. Inside of each cell is a jellylike substance called cytoplasm. Cytoplasm contains chemicals that break up food taken into the cell. It produces building materials and energy for the cell to carry on its life activities. ... This sphere is called the cell’s nucleus. It controls how the cell gets rid of wastes. It controls how the cell reproduces. Without the nucleus, the cell would die. ...
The cell membrane, the cytoplasm, and the nucleus make up the protoplasm of the cell. Protoplasm is a chemical substance that regulates all the cell’s activities. ... It changes food into substances that the cell can use. It gets rid of cells wastes and causes the cell to produce itself. ...
Your body contains five main kinds of tissues.
Approximate Word count = 1311
Approximate Pages = 5.2
(250 words per page double spaced)
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