Cell Specialization: All living organisms are composed of one or more cells – this statement is probably one of the most important principles of the Cell Theory by Theodor Schwann and Matthias Schleiden.
This makes sense given that the body of multi-cellular organisms are made up of them but are not all identical.
By virtue, multicellular organisms are composed of a wide variety of cells, with each cell being specialized to perform a specific function. Of course, in order to be specialized, they need to undergo certain processes.
Let’s explore more about it below.
Table of Contents
- What is Cell Specialization?
- How Does A Cell Become Specialized?
- Examples of Cell Specialization and their Adaptations
- Significance of Cell Specialization
- Opposite Of Cell Specialization
What is Cell Specialization?
Also referred to as cell differentiation, cell specialization is the process wherein “general” or “common” cells evolve to form specific cells that have specific functions. This process is very much prevalent and most important during embryological development. During adulthood, cells called stem cells become specialized in order to replace old and worn-out cells.
How Does A Cell Become Specialized?
The cell life cycle is composed of the interphase (growth stage) and either mitosis or meiosis (division stage). Some cells continue to undergo cell cycle all throughout their lifespan while some terminate in a definite time period. Basically, it is during interphase that cells specialize and it is also during this phase that genes can be selectively activated or deactivated.
- Differentiation occurs many times during the cell cycle as it starts from the cell being a zygote up to more complex ones like tissues. It continues up to adulthood when the cells (adult stem cells) divide to replace cells and worn-out tissues.
All in all, differentiation alters the size of the cell, form and structure, physiological response, and even metabolic activities.
Examples of Cell Specialization and their Adaptations
In order to function efficiently, living organisms differ in the type of cells they are made of. The following are just some of the most common specialized cells in plant and animal cells. :
1. Xylem and Phloem
- In order to carry these functions out, the xylem vessels are consisted of both living plant cells with very thick cell wall and dead cells. On the other hand, the phloem is made up of living cells that are arranged in columns.
2. Root Hair Cells
- In general, these cells are characterized by having a large surface area which then increases surface area for absorption.
- In addition to that, these cells also contain a lot of mitochondria that sustain the high energy requirement for active transport.
3. Red Blood Cells
- Inside their cytoplasm, they have the pigment hemoglobin which can combine with oxygen, resulting to the formation of oxyhemoglobin.
- It is believed that the lack of nucleus in the red blood cells is an adaptation to accommodate more hemoglobin, thus resulting to more transported oxygen.
4. Muscle Cells
- Such specialization enables the muscle cells to perform their function during the contraction and relaxation of muscles in order to produce movements.
- Another thing is that by having a lot of mitochondria, muscle cells generate a lot of ATP (energy) which then sustains the high energy requirement for locomotion.
Significance of Cell Specialization
Aside from the production of cells with specialized functions, the process of cell specialization is important in many other aspects. The following are some of them:
1. Replacement of Old and Worn-out Cells
- The division of these stem cells into specialized cells is often triggered by certain environmental conditions. For instance, these new cells from the stem cells will then be used to replace any old or worn-out cells, hence maintaining their integrity as tissues or organs.
- Interestingly though, these stem cells can remain “un-specialized” until they need to.
2. Preserve the Genetic Material
- During transcription, the DNA becomes prone to mutations and the process of cell specialization makes it less susceptible to them, hence preventing further damage in the gene.
3. Importance in Cell-To-Cell-Communication
- One of the most common examples are the neurons or nerve cells in animals. These cells can send impulses to other nerve cells or other types of cells as well.
4. Possible Medical Importance
- One of their hypotheses was using stem cells and inducing them to differentiate as replacements for the lost cell in the pancreas and the heart.
Opposite Of Cell Specialization
- This process is exhibited by plant and animal cells that do not lose their developmental potential as they grow and develop but instead preserve their plasticity.
- Being plastic, these cells can develop again to new kinds of cells and acquire different functions and tasks. However, dedifferentiation should not be associated with the re-entry of the cell into the cell cycle, but rather the abolishment of the cell from its specialized state back to its pluripotent state.
Now after knowing more about the process, can you imagine a life where evolution never permitted cell specialization? What do you think could have happened?
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