Cell Theory - Biology
Speech on Cell Theory.
Cells are the "building blocks" of the body. A human is made of millions of cells, which are adapted for different functions. They are composed mainly of a cell membrane, cytoplasm, vacuole(s) and a nucleus. They are the foundations of all living organisms, making them probably cells extremely significant when it comes to biology. They are one of the foundations of biology itself. The Cell Theory is a theory that has been composed, changed and altered over a span of 350 years. The theory refers to cells being the basic unit of structure in all living things, and it is a widely accepted explanation of the relationship living things and cells. The cell theory states that:
Cells are the fundamental and structural unit of life.
All organisms are made up of one or more cells.
All cells come from pre-existing cells.
The history of the cell theory is similar to the history of the atomic model, and the periodic law; the cell theory is how it is because of the many contributions and discoveries of scientists throughout history. Cells were first described by an English scientist named Robert Hooke in 1665. He remarked that the boxlike structures looked very much like the small rooms which monks inhabited at monasteries, also known as cellulas, thus deriving the name. However, Hooke was not the first to view living cells under a microscope. What he was seeing was actually the non living cells of a cork, which was cut up into thin slices. Hooke could see the cell walls, but there was no indication of a nucleus and other organelles found in most living cells.
Something similar to what Hooke would of observed, a cork under a microscope.
In 1774, a man named Anton Van Leeuwenhoek, also referred to as the “Father of Microbiology”, a Dutch tradesman and scientist, observed the first living cells. He was the first to describe and observe single celled organisms, which he called animalcules. This was probably...
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