1. Introduction to Biochemistry
Cell Organelles
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In this video, we're gonna do a quick recap on the cytoskeleton. And recall that it consists of actin and intermediate filaments as well as microtubules. And you can think of the cytoskeleton as the skeleton predominant component of specific cell structures, such as flagella and cilia, that allow a cell to move through its environment. And it's also important for the transportation of materials inside of the cell. And because it can respond to specific factors on the outside of the cell, it can be involved in signaling. And so notice below in the diagram, we have the actin filaments down below, which are also known as microfilaments and these are the smallest of the 3. We have intermediate filaments up above here, which are intermediate in size. And we have microtubules or tubulin, which is shown in the middle here, and they are the largest of the 3. And so notice that the intermediate filaments are projected throughout the entire cell and the microfilaments are usually off found on the perimeter of the cell. And we can see that over here in this diagram as well, where the intermediate filaments are projected throughout the entire cell, the microfilaments or the actin are found on the perimeter of the cell, and the microtubules or the tubulin are found projected through specific points of the cell. And recall that the microtubules are very important for nuclear division of eukaryotes or mitosis. And so over here, what we have is an image that shows you what, these components look like under a microscope. And so scientists can stain these different components and the blue represents the nucleus, the green represents microtubules, and the red represents intermediate filaments. And so the last thing I wanna leave you guys with is that these orange structures over here are the mitochondria. And mitochondria and chloroplasts are both very relevant organelles, but we're gonna talk about them in some of our later videos when we talk about the topic of the endosymbiotic theory. And so this concludes our lesson on cytoskeleton, and I'll see you guys in the practice videos.
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