A Tour of the Cell (Chapter 4): Structure and Function of Cells

A Tour of the Cell

Introduction to Cell Biology

Advancements in microscopy have greatly expanded our understanding of the cellular basis of life. Early microscopes were initially considered novelties, but their development led to foundational discoveries in biology.

• Robert Hooke used a crude microscope to examine cork and coined the term "cell" after observing small compartments he called "cellulae" (Latin for "little rooms").

• Antonie van Leeuwenhoek later improved microscopy and observed living cells in blood, sperm, and pond water.

• This chapter explores the structure and function of cells, the basic units of life.

Key Terms:

• Microscopy: The use of microscopes to view objects and areas of objects that cannot be seen with the naked eye.

• Cell: The smallest structural and functional unit of an organism.

Example: The discovery of cells in cork by Hooke marked the beginning of cell theory, which states that all living things are composed of cells and that all cells arise from pre-existing cells.