Match the names of the supporting cells found in column B with the appropriate descriptions in column A. Column A  _______ (1) myelinates nerve fibers in the CNS  _______ (2) lines brain cavities  _______ (3) myelinates nerve fibers in the PNS  _______ (4) CNS phagocyte ________(5) helps regulate the ionic composition of CNS extracellular fluid Column B a. astrocyte b. ependymal cell c. microglial cell d. oligodendrocyte e. satellite cell f. Schwann cell

Video transcript

Hi, everyone. Let's look at our next problem. It says match the names of the structures found in column B with the appropriate descriptions in column A. And how we'll approach this is I'm going to first read through the names that are in column B. So we have in our mind the terms uh or the names that are available to us, then we'll walk through each of the descriptions and pick the term that matches. So the uh structures that we're looking at are a neurofibril B niel bodies, C microglial cell D tract e lipofuscin and F dendrites note that that's six structures. As we go to Callum A and look at the descriptions, we only have five descriptions. So there will be one structure that we don't use. So let's get started. Our first description in column. A number one is convey graded potentials towards the cell body. So we know that neurons communicate through electrical and chemical signals, transmitting electrical signals through the body. And those signals can be traveling away from the neuron or towards the neuron depending on whether it's transmitting or receiving a signal. So what structure in the neuron conveys potentials towards the cell body. Well, that would be choice f the dendrites, it's the axon that conveys potentials away from the cell body. Dendrites receive the signals. So that's short. Number one, number two says a bundle of axons in the C N S. So the central nervous system has these pathways where axons travel together and they actually have connections with each other. And those bundled axons are choice D which is a tract. So a tract is a bundle of axons that comprise a neural pathway. Now let's move on to number three protein making machinery. So, within the neuron, what structure makes proteins, we can go back to general cell biology for that. And we know that that's the endoplasm reticulum is the structure. However, that isn't one of our specific names available to us. So we need to recall that this has a specific name in a neuron. And that's because this area, this structure is often sometimes called the chromaphil substance because it takes up a pigment, a pigment. So it can be seen as a very intensely stained area when looking at these neurons under a microscope. And they have this structure has a very specific name which would be choice be the nestle bodies. So the cell bodies is essentially the rough endoplasm reticulum, which as we can recall from cell biology makes proteins for the cell. Now we're on to number four aging pigment. So a pigment that accumulates in cells with age and that would be choice e Lipofuscin, it's thought to be a byproduct of oxidative respiration and it just builds up in cells over time. It's a yellow brown pigment. So it can be seen in cells and accumulates with age. So you could describe it as an aging pigment. Finally, we're on to number five, which says, maintain cell shape and integrity. And whenever we think of something that maintains a cell shape, we probably want to think about the cytoskeleton. And that means we want to think about things like um uh filaments or fibers, things like that and the structure of a cell. And indeed, that is choice a neuro fibrils. So you have that clue in the name that term fibros. So neurofibril are part of the cytoskeleton. They are sometimes called intermediate filaments and they lend uh a tensile strength. So they keep the neuron from being pulled apart when it's exposed to forces. And they also help maintain the shape as a description says of those axons and dendrites that project outward from the neuron. So we've successfully matched our, all of our descriptions with our terms. Um The name that we didn't use was choice C microglial cell as that didn't match any of our descriptions in column A. So just giving a quick summary of our matching number one was letter F, number two, letter D, number three, letter B, number four, letter E N, number five, letter A. See you in the next video.