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EACHER: Hi, and welcome to the lesson. It's all about human beings. Now, if you look at the picture, we don't all look alike. And if you listen to me, we don't all sound alike. And we know that we don't all think alike. But on the inside, our bodies and what they're made of, everything that's stuffed inside, the fundamentals,
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that's pretty much all the same. And that means that, as humans, it ensures that we all pretty much function the same way. Now, as we look a little more closely at the idea of our similarities, it's going to help us answer our lesson question, how is the human body organized to maintain homeostasis?
Section 2
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TEACHER: Lesson goals. Well, what are we trying to achieve? Well, in order to explore how the human body is organized in order to maintain homeostasis, we need to identify and order the levels of organization in the body. And that'll become clear as we go.
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We're also going to analyze how organ systems function together to maintain homeostasis. In order to do that, we're going to need some words. And of course, the first one is homeostasis. Now, don't panic. It'll become absolutely clear by the time we get there. The next is organ, organ system, and tissue. It's a good time now
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to put these in your eNotes, look them up in your glossary, even if you think you know what they mean, and remember to be on the lookout because it's when we use words in context that helps us to truly understand what we mean. Now, just before we look at how the body is organized, let's review a little bit of what we know about cells. [LOUD METALLIC CLANGING]
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TEACHER: No. Not, not cells with doors. No. No. No. These kinds of cells. Remember that all living things are made of one or more cells
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and that cells are the very basic unit of structure and function for all living things. Now, a piece of bacteria, a little bit of bacteria might be a one-celled structure. A one-celled living thing. Something that has lots of cells would be me. If you remember, I said that the body is organized
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in building blocks, so that cell is our very most basic level. Cells are made of parts that work together, and that's how cells are kept alive. Those parts inside work together. So let's have a look at just some of those parts and remind ourselves what they are. Here, we have the outer covering, which is the cell membrane.
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And all this blue stuff on the inside, that holds everything all together. That's the cytoplasm, the jelly stuff that keeps everything inside. Here, we have the big ball of the nucleus. And around it, we have the endoplasmic reticulum. In this case, the rough. We also have some mitochondria here and here.
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We have some lysosomes here, here, here, and there. We have some vacuoles, the big lima beans and we have a Golgi body right there. We also have lots of these. And if you remember, those are ribosomes. Now, there are other parts. These are the main ones. If you're unsure, go ahead and look it up,
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but I think you can answer the question that comes next with what I've given you.
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