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Cells are the smallest living component of the human body and we need a microscope to view them. The cells which make up our body have 3 main characteristics as shown in Figure 2.8.
They are bound by a plasma membrane which keeps the contents of the cell separated from the rest of the body’s fluid. This characteristic allows the cell to maintain its own unique environment (e.g. concentrations of ions).
They contain cytoplasm. This is the fluid within the cell which contains all of the organelles, and is contained by the plasma membrane.
They usually have a nucleus.
Figure 2.8 A typical human cell (Copyright, QUT)
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