The difference between hypertrophy and hyperplasia lies in their respective mechanisms of tissue growth. Hypertrophy involves an increase in the size of existing cells, while hyperplasia includes an increase in the number of cells through cell division. While both hypertrophy and hyperplasia result in tissue growth, however, they are different in their mechanisms.
In this article, we will cover the major differences between hypertrophy and hyperplasia and study them in brief.
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What is Hypertrophy?
Hypertrophy refers to the increase in the size of existing cells, leading to the enlargement of tissues or organs. This process often occurs in response to increased workload or stimulation, such as muscle growth due to exercise.
Let us take an example of the hypertrophy of skeletal muscle resulting in microscopic damage in the muscle fibres due to regular resistance training. During this process, the muscle cells can go under hypertrophy which increases the size of cells by synthesizing more contractile proteins.
What is Hyperplasia?
Hyperplasia is an increase in the number of cells in a tissue or an organ, which results in overall growth. It mostly occurs due to cell division or proliferation. Triggered by various factors like stimulation of hormonal or tissue damage.
An example of this is the enlargement of the uterus during pregnancy. It will occur due to the influence of estrogen and progesterone. Here the uterine cells will undergo hyperplasia which leads to an increase in the size of the organ to develop the fetus.
Also Read: Diagram of Uterus
Difference Between Hypertrophy and Hyperplasia
The differences between hypertrophy and hyperplasia are as follows:
Characteristics | Hypertrophy | Hyperplasia |
| Definition | The increase in the cell size without an increase in cell number. | Increase in cell number resulting in tissue growth. |
| Mechanism | Existing cells enlarge through protein synthesis. | New cells are formed through cell division. |
| Trigger | Increased workload or stimulation. | Hormonal factors or tissue damage. |
| Tissue Size | Enlargement of existing tissue. | The overall growth of tissue. |
| Cellular Changes | Increase in cell size. | Increase in cell number. |
| Examples | Muscle hypertrophy due to exercise. | Uterine hyperplasia during pregnancy. |
| Organ Adaptation | Allows tissues to generate greater force. | Accommodates the growing fetus. |
Occurrence | Common in tissues capable of regeneration | Often occurs in response to injury or tissue growth |
| Developmental Biology | Organ growth during development. | Tissue growth in embryogenesis. |
Conclusion - Difference Between Hypertrophy And Hyperplasia
In summary, Hypertrophy and hyperplasia are the two types of physiological processes which increase cells in an organ or tissue. While they both result in tissue growth, however, they are different in their mechanisms. Hypertrophy will lead to an increase of existing cells which results in the enlargement of the affected tissue. Hyperplasia is an increase in the number of cells leading to an overall increase in tissue volume.