072 The Four Types Of Cellular Adaptations

As cells get exposed to an injurious agent, these cells then try to adapt such that an injury would be prevented.

Watch and learn what these adaptations are in this video. More to come on the details of each.


Transcript of Today’s Episode

Hello and welcome to another episode of Interactive Biology TV where we’re making Biology fun. My name is Leslie Samuel, and in this episode, I’m going to be talking about the four types of cellular adaptations.

Two videos ago, I answered the question, “What is a disease?” And, in the last episode, what I spoke about were the “Five Causes of Disease.” The first cause, the number one cause of disease was adaptation, and what I said was that an adaptation is a cellular reaction to prevent injury. So, there’s an injurious agent in the environment of the cell, and the cell reacts in a way to prevent injury.

You can go back and check out those videos, but in this video, what I want to talk about is the first cause of disease which is an adaptation. So, what we’re going to do is we’re going to talk about the four types of adaptations.

Adaptation number one is atrophy. Atrophy is when the cell decreases its functional part. The cell is basically reducing its size by decreasing its functional parts. That’s number one.

Number two is hypertrophy. That is when the individual cells increase in size, and that of course, is going to cause the tissue to increase in size.

Then, there’s hyperplasia. Hyperplasia is when we have more cells being formed. So, the cells are replicating, and as a result of that, the tissue is increasing in size.

With hypertrophy, we have the tissue increasing in size because the individual cells are increasing in size. In hyperplasia, we have the tissue increasing in size because we’re getting more cells, which make sense.

Then, the last type of adaptation will be metaplasia. And, that is when we have one tissue type that’s replaced by another tissue type. So, these are the four types of adaptations.

I’m going to go into more detail about those adaptations in later videos, but for this video, all I want you to be able to do is remember those four adaptations.

      1.  Atrophy.
      2. Hypertrophy.
      3. Hyperplasia.
      4. Metaplasia.

And, you can say it with me. Let’s say it together.

Number one is atrophy, hypertrophy, hyperplasia, and metaplasia. We can kind of say it together. We can almost dance to it. it’s that simple. So, atrophy, hypertrophy, hyperplasia, and metaplasia.

In the next video, we’re going to go into detail about atrophy, and we’re going to continue from there.

That’s it for this video.

If you want more videos like this, and more resources to help make Biology fun, I invite you to visit the website at Interactive-Biology.com.

That’s it for this video, and I’ll see you in the next one.


  1. mrsramos777 September 25, 2012 at 7:04 am #

    Where are the videos of the break down of each 4 types of adaption – Atrophy, Hypertrophy, Hyperplasia, and Metaplasia?


  2. ziyad saleem September 29, 2012 at 5:19 pm #

    please Dr,
    Where are the videos of the break down of each 4 types of adaption – Atrophy, Hypertrophy, Hyperplasia, and Metaplasia?


  3. ProAssassin63 October 14, 2012 at 2:19 pm #

    Where are the 4 other videos???


  4. HaydenICM January 24, 2013 at 3:36 am #

    Leslie, Have you seen “The Beautiful Truth” documentary? Maybe you should show it to your class. Your love for teaching really comes through in the videos. Can I take you class and get a book and follow along with you?


  5. linda swartzen January 26, 2013 at 11:05 am #

    very interesting…do you have a web sight? Can Adaption begin due to emotional injury?


  6. Raechelle Gretencord March 15, 2013 at 10:54 am #

    Your work is soo awesome!! You are truly helping me through every Nursing class I am taking! Thank you!


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