chapter 3: cell structure and function
DESCRIPTION
Chapter 3: Cell Structure and Function. Section 3.1 – History of Cytology. Objective:. Identify the scientists that helped discover the cell theory. Discuss the importance of the invention of the microscope. History of the Cytology. - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Chapter 3: Cell Structure and Function](https://reader036.vdocuments.mx/reader036/viewer/2022062520/56815f82550346895dce891b/html5/thumbnails/1.jpg)
Chapter 3: Cell Structure and Function
Section 3.1 – History of Cytology
![Page 2: Chapter 3: Cell Structure and Function](https://reader036.vdocuments.mx/reader036/viewer/2022062520/56815f82550346895dce891b/html5/thumbnails/2.jpg)
Objective:
Identify the scientists that helped discover the cell theory.Discuss the importance of the invention of the microscope.
![Page 3: Chapter 3: Cell Structure and Function](https://reader036.vdocuments.mx/reader036/viewer/2022062520/56815f82550346895dce891b/html5/thumbnails/3.jpg)
History of the CytologyMany people feel
that Anton van Leeuwenhoek
invented the first microscope.
However this has been disputed in
recent years - Zacharias Jansen is now thought to
be the original inventor in 1595.
![Page 4: Chapter 3: Cell Structure and Function](https://reader036.vdocuments.mx/reader036/viewer/2022062520/56815f82550346895dce891b/html5/thumbnails/4.jpg)
History of the CytologyDuring the 1600’s, Leeuwenhoek used his microscopes to look at drops of pond water and other liquids.He discovered that the water contained tiny living things.
Animalcules
![Page 5: Chapter 3: Cell Structure and Function](https://reader036.vdocuments.mx/reader036/viewer/2022062520/56815f82550346895dce891b/html5/thumbnails/5.jpg)
History of CytologyAt about the same time Robert Hooke, English physicist, used a microscope to observe plants.He pointed out that the woody parts (cork) of plants contained tiny rectangular chambers, which he called cells.
![Page 6: Chapter 3: Cell Structure and Function](https://reader036.vdocuments.mx/reader036/viewer/2022062520/56815f82550346895dce891b/html5/thumbnails/6.jpg)
History of CytologyIn 1839, German biologist Theodor Schwann, found that some animal tissues closely resembled the circular tissues of plants.As he observed the tissues with better and better microscopes, he concluded that animals are composed of cells as well.
![Page 7: Chapter 3: Cell Structure and Function](https://reader036.vdocuments.mx/reader036/viewer/2022062520/56815f82550346895dce891b/html5/thumbnails/7.jpg)
History of CytologyAlso during this time, Robert Brown discovered an object near the center of many cells – the nucleus.German biologist Matthias Schleiden expanded on Brown’s work, suggesting that the cell’s nucleus plays a role in cell reproduction.
![Page 8: Chapter 3: Cell Structure and Function](https://reader036.vdocuments.mx/reader036/viewer/2022062520/56815f82550346895dce891b/html5/thumbnails/8.jpg)
History of CytologyIn 1855, German physician Rudolf Virchow proposed that animal and plant cells are produced only by cell division.
![Page 9: Chapter 3: Cell Structure and Function](https://reader036.vdocuments.mx/reader036/viewer/2022062520/56815f82550346895dce891b/html5/thumbnails/9.jpg)
The discoveries and observations of these scientists make up what is now known as the cell theory.
![Page 10: Chapter 3: Cell Structure and Function](https://reader036.vdocuments.mx/reader036/viewer/2022062520/56815f82550346895dce891b/html5/thumbnails/10.jpg)
Cell TheoryAll living things are composed of cells.Cells are the smallest working units of living things.All cells come from preexisting cells by cell division.