Major Contributors to Cell Theory

Lesson Transcript
Instructor: Kevin Newton

Kevin has edited encyclopedias, taught history, and has an MA in Islamic law/finance. He has since founded his own financial advice firm, Newton Analytical.

The idea that all living things are made up of cells which can only come from other living cells, is known as cell theory. In this lesson, we take a look at the scientists who helped to further its understanding.

Cell Theory

Many sciences come down to the study of very basic concepts. Chemistry examines atoms and molecules. Physics looks at forces. Biology examines cells. Cells are the tiniest units of structure that can be said to be alive. Sure, viruses are smaller, but they are the zombies of the microscopic world, stuck in a sort of half-living, half-dead existence. But cells have life!

Much of what we know about cells comes from the idea of cell theory. At its most basic level, cell theory has a few foundational ideas, namely that living things are made up of cells, cells are themselves living, and cells can only be created from other cells. The development of cell theory took time. In this lesson, we'll look at four individuals who did more for its development than anyone else.

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  • 0:01 Cell Theory
  • 0:58 Hooke
  • 1:56 Schleiden
  • 2:45 Schwann
  • 3:20 Virchow
  • 4:03 Lesson Summary
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Hooke

It's kind of hard to come up with cell theory without anyone knowing that cells even existed. Luckily, we have Robert Hooke, a 17th-century English scientist to thank; he discovered that cells exist in the first place. Like many other scientists from the period, Hooke dabbled in a number of scientific fields. In fact, he wrote Isaac Newton frequently about the idea of gravity and is fairly well known for his work on the forces of springs. One of the most popular new inventions of the time was the microscope, a mechanism that allowed people to examine finer details than they had ever thought possible. One day, Hooke got the idea to examine a piece of cork under his microscope. After looking, he found that the cork was made up of thousands of tiny pockets, almost like a honeycomb. He chose to describe these spaces as cells, because they reminded him of the living quarters of monks in a monastery.

Schleiden

Still, it would be more than 200 years until cell theory moved much further. By this point, microscopes had grown to be much more useful. Someone who would make the most of that was Matthias Schleiden, a German scientist. Originally trained as a lawyer, he was really more interested in botany. He began to examine his plants under a microscope and found that they were actually composed of the same cells that Hooke had described, no matter where in the plant the sample came from. With that information, he began to write about the importance of cells and stated that all plants were made up of cells. However, that wasn't all that Schleiden discovered about cells. He also found that they had a structure of their own, and found that the nucleus was vitally important in cellular operations.

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