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LearningTranscript
00:00Assalamualaikum today our topic of discussion is epithelial tissue. Epithelial tissue is
00:10a type of animal tissue. Epithelial tissue covers the outside of body. What does it mean?
00:21What is present on our entire body? Skin. So actually skin is made up of epithelial tissue.
00:33This is our skin and skin is made up of epithelial tissue and skin is present outside the body.
00:42And this skin protects our body from the external environment.
00:49That is, there are different types of bacteria and viruses in our external environment.
00:56They do not let them enter the body.
01:01In this way, lines, organs and cavity.
01:05And all these hollow organs and cavities are present in their inner lining.
01:14Like we have a stomach, they are hollow from inside.
01:18So we have cut it from here.
01:21The soft tissue inside it is actually made up of epithelial tissue.
01:33So epithelial tissue, our skin is also made up of epithelial tissue.
01:42And all the hollow organs and cavities, their inner lining is also made up of epithelial tissue.
01:50And we know that different cells make up a tissue.
01:54So all the cells in epithelial tissue are closely packed with each other.
01:59That is, there is no gap between them.
02:04Now let's see the types of epithelial tissue.
02:08So first of all, let's see how many types of epithelial tissue are there on the basis of shape.
02:15So there are four main types of epithelial tissue on the basis of shape.
02:20Squamous epithelium
02:22Ciliated columnar epithelium
02:24Simple cuboidal epithelium
02:27Simple columnar epithelium
02:31So squamous epithelium are flat.
02:36As shown here, it is flat.
02:42And in the middle, you can see the red color structure.
02:48This is its nucleus.
02:50Because tissues are made up of cells.
02:53And what is present in the center of the cell?
02:55Nucleus.
02:57In this way, if we talk about ciliated columnar epithelium.
03:02So it is elongated and cilia are present on top of it.
03:07This is cilia and this is an elongated cell.
03:11It is a tissue.
03:13In this way, if we talk about cuboidal epithelium, it is of cube shape.
03:18As shown here.
03:22And in this way, if we talk about columnar epithelium, it is also elongated.
03:28So what is the difference between columnar epithelium and ciliated columnar epithelium?
03:34Both are elongated.
03:36But in ciliated columnar epithelium, cilia are also present.
03:41Whereas in simple columnar epithelium, cilia are not present.
03:46On the basis of layer, how many types of epithelium tissue are there?
03:53It also has four main types.
03:57Stratified squamous epithelium
03:59Stratified ciliated columnar epithelium
04:02Stratified cuboidal epithelium
04:05Stratified columnar epithelium
04:20Stratified means layer.
04:22Stratified means failure.
04:25So what is the difference between squamous epithelium and stratified epithelium?
04:31In simple squamous epithelium, only one flat layer is present.
04:38Whereas in stratified squamous epithelium, more layers are present.
04:50If more than one flat tissue layer is present, then it is called stratified squamous epithelium.
04:59If only one layer is present, then it is called squamous epithelium.
05:04If only one ciliated columnar epithelium is present, then it is called ciliated columnar epithelium.
05:12If more than one ciliated layer is present, then it is called stratified columnar epithelium.
05:22Similarly, if only one cuboidal epithelium is present, then it is called simple cuboidal epithelium.
05:29If more than one layer is present, then it is called stratified.
05:33Because stratified means layer.
05:35Similarly, in columnar epithelium, there is only one elongated epithelium tissue.
05:40If more than one elongated epithelium is present, then it is called stratified columnar epithelium.
05:46So squamous epithelium is a single layer flat and it has only one layer present and it is
06:07found in lungs, heart and blood vessels.
06:10The inner lining of heart is made of squamous epithelium and lung is made of squamous epithelium and blood vessel is made of squamous epithelium.
06:34The function of squamous epithelium is to exchange the material.
06:40As it is flat and it has only one layer present, it can be easily exchanged.
06:48The inner lining of lungs is made of squamous epithelium and blood vessel is made of squamous epithelium and blood vessel is made of squamous epithelium.
07:14Squamous epithelium transports oxygen to the whole body.
07:20Blood vessels are present in the whole body and it transports oxygen to the whole body.
07:30Squamous epithelium transports oxygen to the lungs.
07:38Squamous epithelium transports oxygen to the lungs.
08:04Next is cuboidal epithelium.
08:08It has only one layer and it is cube shaped.
08:10It is found in kidney tubes and small glands.
08:12It is used for secretion.
08:14It is found in kidney tubes and small glands.
08:26It is found in kidney tubes and small glands.
08:40Columnar epithelium is elongated.
08:48It is found in alimentary canals.
08:50Columnar epithelium is elongated.
08:52Columnar epithelium is elongated.
08:54Columnar epithelium is elongated.
08:56Columnar epithelium is elongated.
08:58Columnar epithelium is elongated.
09:00Columnar epithelium is elongated.
09:02Columnar epithelium is elongated.
09:04Columnar epithelium is elongated.
09:06Columnar epithelium is elongated.
09:08Columnar epithelium is elongated.
09:10Columnar epithelium is elongated.
09:12Columnar epithelium is elongated.
09:14Columnar epithelium is elongated.
09:16Columnar epithelium is elongated.
09:18Columnar epithelium is elongated.
09:20Columnar epithelium is elongated.
09:22Columnar epithelium is elongated.
09:24Columnar epithelium is elongated.
09:26Columnar epithelium is elongated.
09:28Columnar epithelium is elongated.
09:30Columnar epithelium is elongated.
09:32Columnar epithelium is elongated.
09:34Columnar epithelium is elongated.
09:36Columnar epithelium is elongated.
09:38Columnar epithelium is elongated.
09:40Columnar epithelium is elongated.
09:42Columnar epithelium is elongated.
09:44Columnar epithelium is elongated.
09:46Columnar epithelium is elongated.
09:48Columnar epithelium is elongated.
09:50Columnar epithelium is elongated.
09:52Columnar epithelium is elongated.
09:54Columnar epithelium is elongated.
09:56Columnar epithelium is elongated.
09:58Columnar epithelium is elongated.
10:00Columnar epithelium is elongated.
10:02Columnar epithelium is elongated.
10:04Stratified epithelium is flat.
10:06Stratified epithelium is flat.
10:08Stratified epithelium is flat.
10:10Stratified epithelium is flat.
10:12Stratified epithelium is flat.
10:14Stratified epithelium is flat.
10:16Stratified epithelium is flat.
10:18Stratified epithelium is flat.
10:20Stratified epithelium is flat.
10:22Stratified epithelium is flat.
10:24Stratified epithelium is flat.
10:26Stratified epithelium is flat.
10:28Stratified epithelium is flat.
10:30Stratified epithelium is flat.
10:32Stratified epithelium is flat.
10:34Stratified epithelium is flat.
10:36Stratified epithelium is flat.
10:38Stratified epithelium is flat.
10:40Stratified epithelium is flat.
10:42Stratified epithelium is flat.
10:44Stratified epithelium is flat.
10:46Stratified epithelium is flat.
10:48Stratified epithelium is flat.
10:50Stratified epithelium is flat.
10:52Stratified epithelium is flat.
10:54Stratified epithelium is flat.
10:56Stratified epithelium is flat.
10:58Stratified epithelium is flat.