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    Module 1

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    1. The cell theory states that all living things are made of cells, cells are the basic unit of structure and function, and new cells are produced from existing cells. 2. Key contributors to cell theory included Robert Hooke, who first observed cells, and Matthias Schleiden and Theodor Schwann who proposed that cells are fundamental to both plants and animals. 3. Rudolph Virchow further contributed the principle that cells only arise from pre-existing cells, completing the cell theory which is fundamental to biology.

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    Module 1

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    1. The cell theory states that all living things are made of cells, cells are the basic unit of structure and function, and new cells are produced from existing cells. 2. Key contributors to cell theory included Robert Hooke, who first observed cells, and Matthias Schleiden and Theodor Schwann who proposed that cells are fundamental to both plants and animals. 3. Rudolph Virchow further contributed the principle that cells only arise from pre-existing cells, completing the cell theory which is fundamental to biology.

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    1. The cell theory states that all living things are made of cells, cells are the basic unit of structure and function, and new cells are produced from existing cells. 2. Key contributors to cell theory included Robert Hooke, who first observed cells, and Matthias Schleiden and Theodor Schwann who proposed that cells are fundamental to both plants and animals. 3. Rudolph Virchow further contributed the principle that cells only arise from pre-existing cells, completing the cell theory which is fundamental to biology.

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    © All Rights Reserved
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    6 views3 pages

    Module 1

    Uploaded by

    xuxi
    1. The cell theory states that all living things are made of cells, cells are the basic unit of structure and function, and new cells are produced from existing cells. 2. Key contributors to cell theory included Robert Hooke, who first observed cells, and Matthias Schleiden and Theodor Schwann who proposed that cells are fundamental to both plants and animals. 3. Rudolph Virchow further contributed the principle that cells only arise from pre-existing cells, completing the cell theory which is fundamental to biology.

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    Lesson 1 : Cell Theory

    Reviewed?

    URL https://www.youtube.com/watch?v=4OpBylwH9DU

    Levels of Organization:

    1. Cell: Basic unit of structure and function of all living things.

    2. Tissue: A group of similar cells working together for a specific purpose.

    3. Organ: A collection of tissues that perform a common function. Examples are the
    brain, heart, and leaves.

    4. Organ System: Organs that work together to perform a larger function. For
    instance, the heart and blood vessels form the circulatory system.

    5. Organism: An individual living thing made up of one or more organ systems.

    6. Population: Organisms of the same species living in the same area.

    7. Community: All populations of different species living in a specific area.

    8. Ecosystem: consists of all living things (biotic factors) along with nonliving
    elements (abiotic factors) like water and sunlight.

    9. Biosphere: The collection of all ecosystems, covering land, water, and even the
    atmosphere.

    Origins of the Cell Theory:

    1. Robert Hooke (1665)

    He was the first scientist to use the word “cells” in 1665 while observing cork
    under a microscope.

    Lesson 1 : Cell Theory 1


    He noticed small chambers resembling “honeycombs” or small “boxes or
    bladders of air”, unaware they were dead cells.

    2. Matthias Schleiden (1838):

    Studied plants and suggested that all living things are made of cells or their
    products.

    Believed that cells formed through crystallization.

    3. Theodor Schwann (1839):

    Studied animal tissue.

    In 1893, he realized that similarities existed with Schleiden's findings.

    Proposed that cells are fundamental to both plants and animals, starting
    cytology (cell study).

    It also resulted in the conclusion that cell is the smallest unit of all living matter.

    4. Rudolph Virchow (1858):

    recognized as the Father of Pathology, gained prominence through his


    editorial essay titled "Cellular Pathology.”

    In this essay, he introduced the Latin phrase "omnis cellula e cellula,"


    conveying the idea that all cells arise from cells.

    The Cell Theory

    The ideas of all three scientists namely, Schwann, Schleiden, and Virchow, led to the
    development of the Cell Theory, which is one of the fundamental theories unifying all the
    topics in Biology.

    The Cell Theory states that:

    1. All living organisms are made up of one or more cells

    All living things are made of cells. These can be single cells or groups of
    cells that make up bigger organisms like plants and animals.

    Lesson 1 : Cell Theory 2


    Some organisms consist of a single cell and are known as unicellular or
    single celled organisms.

    Examples include bacteria and protozoans.

    Other organisms are made up of multiple cells and are called multicellular
    or multi-celled organisms.

    Examples include animals, plants, and fungi.

    2. The cell is the basic structural and functional unit of life

    The cell is life's fundamental building block, responsible for all vital functions.
    All biological or living processes that occur within the body for it to survive
    happen in the cells.

    For example, red blood cells are important to the human body. These
    cells carry oxygen to the different parts of the body. Oxygen is important
    in cellular respiration.

    3. Cells arise from pre-existing cells

    Every cell comes from one another cell that existed or lived before it.

    This idea is a part of the Cell Theory and relates to cell division, where one
    cell divides to make two or more cells. This is the basis of cellular
    reproduction.

    Lesson 1 : Cell Theory 3

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