The cell is the simplest element in an organism. It builds the structure of the human body. You must have heard about cells as the source of electric power. Likewise, the cell develops a basic body structure by integrating many elements. The three parts of cell theory explain the functions of the cell. Robert Hooke cell theory and Leeuwenhoek cell theory are important contributions to the development of scientific theories about life. Continue reading to know more about the cell theory.
1. What is Cell Theory?
Cell theory explains the presence of cells, which develop into a living organism. There are three parts of cell theory. They explain the existence of cells in organisms, the pre-existence of cells, and the significance of cells. This scientific theory is true for both plants and animals. The development of this theory happened in the 19th century, which was then termed modern cell theory. (See How many Types of Cells are There in The Human Body?)
2. Cell Theory was given by?
The structure of the cell was first identified by Robert Hooke during the modification of the compound microscope. In his work, Micrographia, Hooke looked at the piece of cork and noticed small honeycomb-like structures. These structures were later named cells. It was later developed by Leeuwenhoek when he discovered the presence of cells in bacteria and protozoa. The Robert Hooke cell theory and the Leeuwenhoek cell theory are major developments that led to the perfection of the cell theory in the 20th and 21st centuries. Also, check out the 90 Mind Blowing Human Body Facts.
3. Who modified Cell Theory?
In the 19th century, Theodore Schwann and Mattias Schleiden introduced a modified version of the cell theory. However, in 1855, Rudolf Virchow modified this theory and observed that cells evolved from pre-existing cells. So, it was Richard Virchow who introduced the common legacy of the cells. The concept of developing new cells from the pre-existing cell was modified in the new cell theory. The discovery of animal and plant cells by Robert Hooke and Leeuwenhoek is followed by the introduction of the structure of the cell from the existing plant or animal cell. (See What is Human Existence In Philosophy?)
4. What is Modern Cell Theory?
The modern cell theory was developed in the 19th century by Theodore Schwann and Mathias Schleiden. Below is the significance of modern cell theory:
- It was stated that every living being is composed of cells. (See How many Heartbeats in a Day of Humans?)
- A group of cells is connected to build the tissue. The organism that is formed out of the tissue and the organs are termed unicellular and multicellular.
- The modern cell theory also introduced that the internal activities in the body of a living organism happen inside the fundamental unit of the cell.
- The efficacy of the cellular structure is seen in the biological and chemical reactions inside the body.
- There is active transmission of energy and ions from one cell to another.
- Cellular respiration is significant in the survival of an organism.
- According to modern cell theory, the virus is not a cell but an external RNA that destroys the functions of the cell in an organism and replicates as a host.
You must read about the three parts of cell theory in the upcoming section. (See How Many Cells Are in the Human Body?)
5. What are the Three Parts of Cell Theory?
The classical cell theory included three major parts which constituted the functions of the cell.
- Every living being contains a cell or several cells.
- A cell makes up the basic structure of an organism. It is therefore the fundamental building block in life.
- There are pre-existing cells that procreate new cells. There is a legacy attached to the formation of cells.
When the cell theory was modified, additional observations were included. These included cell structure, energy transmission, and cell division. In the following few sections, you can explore more about the three parts of cell theory. (See What are Physical Characteristics of a Person?)
6. How Many Principles are There in Cell Theory?
The principles of cell theory are classified into three. These three principles are components of the basic functioning of a living cell.
- The basic functioning of the cell is the creation, coordination, and maintenance of the structure of the organism.
- It controls the voluntary and involuntary activities of the organism.
- The replication of the cell and its division is a major aspect of cell theory in real life. (See What are Examples of Elements in Everyday Life?)
7. What are the Principles of Cell Theory?
The three principles of the cell theory clarify the presence of a single unit that develops life in an organism. The cell theory exists on these primary concepts, which are
- Universality of cell: The cell is a major constituent in every organism. In the universe, the presence of a body is maintained by the presence of a cell.
- Basic unit of life: The DNA in the cell replicates to form tissues. These tissues generate organs and then the organism is formed. If you notice the development of the fetus inside the body of the mother, you can understand the process. A single cell leads to the formation of a human being.
- Ancestry of cells: The procreation of cells is a significant aspect of cell theory. The living cell arises from a previously developed cell. This cell undergoes cell division. The cell division can be aerobic or anaerobic according to the structure of the cell. (See When and How do Body Systems Work together?)