Cell Theory Notes PDF

Robert Hooke – English scientist who first used the term “cell” to describe cells. Discovered this while looking at cork.1660 Anton Van Leeuvonhoek – discovered microscopic organisms 1675 dutch; major contributor to microscopes – built more than 500 in his lifetime! Saw single-celled “animalcules”;...

Robert Hooke – English scientist who first used the term “cell” to describe cells. Discovered this while looking at cork.1660 Anton Van Leeuvonhoek – discovered microscopic organisms 1675 dutch; major contributor to microscopes – built more than 500 in his lifetime! Saw single-celled “animalcules”; failed to see them reproduce and further perpetuated the idea that life came from nothingness. Robert Brown – Scottish physician in the 1830’s first to use the term nucleus. Mathias Schleiden – noted that cells were the basic units of plants Theodore Schwann – compared animal cells to plant cells Rudolph Virchow – stated that all cells come from pre- existing cells; challenged spontaneous generation and that cells form from the inside out. Cell Theory – Cells are the fundamental unit of all life. Emerged in the 19th century as a result of the work of many scientists. 1. All living things are composed of 1 or more cells 2. Cells are the basic unit of life – the smallest unit or thing that has the characteristics of life. Anything smaller than a cell is chemistry. 3. Cells come from pre-existing cells. Cells --- Tissues -------- Organs ----- Organ Systems ------  Organisms