Simple Squamous Epithelium
Simple squamous epithelium is located within the alveoles of the lungs. These cells within the tissue are classified as one layer (simple) of flat (squamous) cells. They cannot take up much space because their size is imperative to the jobs that the alveoles hold. The alveoles are in charge of the gas transfer in the capilaries, so they must be miniscule in order to perform this job. These tissues are able to control the permeability of blood vessels within the lungs. When you breath in, yourcapillaries become more permeable, allowing oxygen to be absorbed into the bloodstream. The opposite occurs when you breath out.
Stratified Squamous Epithelium
Stratified squamous epithelium is commonly found on the surfaces of the mouth, especially your tongue, and your throat. These cells are stratified, meaning there are many layers of them, which allows the areas they cover to be protected from the everyday wear and tear that the average person puts on their mouth and throat. When a layer is worn down, it can easily be replaced by the layer of cells underneath it. The function of this type of tissue is for physical protection against abrasions and pathogens that enter the body. If a herpes virus enters your mouth, you are protected from it as long as you do not have an open wound.
Pseudostratified Columnar Epithelium
Pseudostratified ciliated columnar epithelium can be seen along the linings of the nasal cavity, trachea, and bronchi. It is extremely important that it is ciliated because the cilia can trap pathogens before they are able to enter your lungs. They also give the cells more surface area to absorb nutrients. These types of tissues appear to be stratified, however they are not, hence pseudo- meaning false. The columnar shape indicates exactly how it sounds--columnar. They provide protection and also allow for secretions to occur, mostly of mucus to further protect from pathogens.
Simple squamous epithelium is located within the alveoles of the lungs. These cells within the tissue are classified as one layer (simple) of flat (squamous) cells. They cannot take up much space because their size is imperative to the jobs that the alveoles hold. The alveoles are in charge of the gas transfer in the capilaries, so they must be miniscule in order to perform this job. These tissues are able to control the permeability of blood vessels within the lungs. When you breath in, yourcapillaries become more permeable, allowing oxygen to be absorbed into the bloodstream. The opposite occurs when you breath out.
Stratified Squamous Epithelium
Stratified squamous epithelium is commonly found on the surfaces of the mouth, especially your tongue, and your throat. These cells are stratified, meaning there are many layers of them, which allows the areas they cover to be protected from the everyday wear and tear that the average person puts on their mouth and throat. When a layer is worn down, it can easily be replaced by the layer of cells underneath it. The function of this type of tissue is for physical protection against abrasions and pathogens that enter the body. If a herpes virus enters your mouth, you are protected from it as long as you do not have an open wound.
Pseudostratified Columnar Epithelium
Pseudostratified ciliated columnar epithelium can be seen along the linings of the nasal cavity, trachea, and bronchi. It is extremely important that it is ciliated because the cilia can trap pathogens before they are able to enter your lungs. They also give the cells more surface area to absorb nutrients. These types of tissues appear to be stratified, however they are not, hence pseudo- meaning false. The columnar shape indicates exactly how it sounds--columnar. They provide protection and also allow for secretions to occur, mostly of mucus to further protect from pathogens.