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Stratified Squamous Epithelium

Stratified Squamous Epithelium. Function: This is the body’s WEAR-N-TEAR tissue. It is made to take lots low energy friction, exposure to the environment, protect us from fluid loss and invasion. Simple Cuboidal. Function: A big secretor ! It makes up all types of glands.

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Stratified Squamous Epithelium

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  1. Stratified Squamous Epithelium • Function: This is the body’s WEAR-N-TEAR tissue. It is made to take lots low energy friction, exposure to the environment, protect us from fluid loss and invasion.

  2. Simple Cuboidal • Function: Abig secretor! It makes up all types of glands. • Location: There are a few places in the body that you will find that this tissue absorbs. It is easy to know…just look for the mircrovilli., like the kidney tubes (nephrons).

  3. Stratified Cuboidal • This tissue secretes and is usually found in sweat glands and larger glands (Endocrine)

  4. Simple Cuboidal: Gland Types • Endocrine glands: (endo-inside) Makes their product and secretes it into the matrix. • Capillaries come inside the gland and pick up the product. The follicular epithelium is primarily simple cuboidal, but some are simple squamous.

  5. Simple Cuboidal: Gland Types • Exocrine glands: (exo-outside) This type of gland secretes its products using a duct. The product is placed into or onto an open area. • Examples of exocrine product are saliva, mucous, enzymes, oil/wax, reproductive fluids, and milk.

  6. Simple Columnar • Function: This tissue is a big absorber! Just look for the microvilli. (I.E. Intestines) • Location: This tissue is also found in many places in the body with cilia. (I.E. fallopian tubes or epidydimis)

  7. Simple Columnar • Location: Found ONLY lining the upper respiratory tract (trachea, bronchi, and bronchioles). The cells have cilia in order to sweep debris out of the lungs. • This tissue also has GOBLET CELLS. These are one-cell glands and they produce mucin. Mucin is a trapping agent.

  8. Stratified Columnar • Location: This tissue isn’t located in too many places in the body. It is usually found at the ends of the stomach. • This tissue can be replaced by Stratified Squamous if it is constantly damaged by acid reflux (‘Heartburn’).

  9. Pseudostratified Columnar • Remember to key on the nuclei! It may seem like this tissue is more than one layer, but it is not. • The nuclei are all over the place and only give the appearance of being more than one layer!

  10. Stratified Transitional Tissue • Found in areas where there is a lot more stress like the urinary bladder • Must be able to stretch from a cuboidal shape (empty) to a squamous shaped appearance (full) and back again

  11. Stratified Transitional Epithelium • When the urinary bladder is empty, the apex of the cells are rounded and the tissue takes on a cuboidal shape. (Diagram A) • When the bladder fills with urine and begins to distends, the cells flatten out and become squamous shape. (Diagram B)

  12. Review of epithelial tissues • Simple: • Squamous • Cuboidal • Columnar • Psuedostratified columnar (the ‘rule breaker’) • Stratified: • Squamous • Cuboidal • Columnar • Transitional (the ‘rule breaker’)

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