The Modern Cell Theory

What Robert Hooke was viewing were dead, rigid-walled plant cells (in cork bark). Over a century later, two German scientists, Schleiden & Schwann,

Fig. 5.1 The Cell Level and the ''Body Basement'' below it.

Organelle 1

Organelle 1

took a giant step forward in understanding by proposing the Modern Cell Theory. This theory clearly states that the cell is the basic unit of all living things. As such, the Cell Level (number V) is where the structures of the Great Body Pyramid begin to have true physiology, rather than merely body function. That is why we have earlier (Chapter 1) called the Cell Level the body's ''Life-line.'' This means that it is at the level of size and complexity of the individual cell where body functions finally become sophisticated enough to create the conditions of something living.

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