00:01
There are four levels of organization starting off with the cells, then tissues, organ, and then an organ system.
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If we were to use the human body as an example, specifically the circulatory system in charge of our blood, the red blood cell would be the first level.
00:19
Then the cardiac muscle that serves as a tissue.
00:24
The organ would be the heart, and of course our organ system would be the circulatory system.
00:29
And that is in charge of distributing our blood throughout our whole body.
00:35
Moving on to the concept of homeostasis, let's first define it.
00:40
It is physiological processes that help organisms maintain a stable internal environment.
00:45
We need this in order to counteract any changes that are happening to our body.
00:49
So, for example, let's say it's a really cold night and you forgot to bring a sweater...