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Transcript of Epithelial Tissue
Types of Epithelium Tissue pt. 2
The Importance of the Epithelial Tissue
Effective protective barriers are structures such as the outer layer of the skin and lining of the mouth.
The free epithelial cells are modified in ways that reflect their specialized functions.
Types of Epithelial Tissue pt. 1
Simple Squamous Epithelium
Location: Lines in the air sacs (Alveoli) of the lungs where oxygen & carbon dioxide are exchanged.
Stratified squamous epithelium
Forms the outer layer of the skin (epidermis). As skin cells age, they accumulate a protein called keratin and then harden and die. This keratinization produces a covering of dry, tough, protective material that prevent water and other substances from escaping underlying tissues and blocking various chemicals and microorganisms from entering.
Characteristics: Fits tightly together, somewhat like floor tiles, & their nuclei are usually broad and thin.
Simple Cuboidal Epithelium
Location: Covers the ovaries & lines most of the kidney tubules & the ducts of certain glands, such as the salivary gland, thyroid gland, pancreas, & liver.
Stratified cuboidal epithelium
Lines the larger ducts of the mammary glands, sweat glands, salivary glands, and pancreas. It also forms the lining of development ovarian follicles and seminiferous tubules, which are parts of the female and male reproductive systems, respectively.
Functions: In the kidneys. This tissue's function is in secretion & absorption; in glands, it secretes glandular products.
Characteristics: cube shaped
Simple Columnar Epithelium
Characteristics: elongated; that is, they are longer than they are wider.
Location: Nonciliated simple columnar Epithelium lines the uterus & most organs of the digestive tract, including the stomach & the small & large intestines.
Function: Protects underlying tissue
Stratified columnar epithelium
The superficial cells are columnar, whereas the basal layers of consist of cuboidal cells. Small amounts of stratified columnar epithelium are found in the male urethra and ducts deferens and in parts of the pharynx.
Pseudostratified Columnar Epithilium
Location: Lines the passage of the respiratory system
Characteristics: Appears layered, but is NOT layered. Varies in shape.
Function: Traps dust & microorganisms that enter with the air.
Forms the inner lining of the urinary bladder and lines the ureters and the superior urethra. When the wall of one of these organs contracts, the tissue consists of several layers of cuboidal cells; However, when the organ is distended, the tissue stretches, and the physical relationships among the cells change.
Such cells are usually found within columnar or cuboidal epithelium, and one or more of these cells constitute a gland . Exocrine glands are glands that secrete their products into ducts that open onto surfaces, such as the skin or the lining of the digestive tract. Endocrine glands are glands that secrete their products into tissue fluid or blood. Merocrine glands are glands that release fluid by exocytosis, Apocrine glands are glands that lose small portions of their glandular cell bodies during secretion, Holocrine glands are glands that release entire cells that disintegrate to release cell secretions.
Protection, secretion, absorption, and excretion.
Covers body surfaces, covers and lines internal organs, compose glands.
Lack blood vessels, readily divide, cells are tightly packed.
What are the types of epithelial tissue mentioned in part 1 ?
Where is epithelial tissue found ?
what is the function of simple cuboidal epithelium ?
how many types of epithelial tissues are there ?
Why is epithelial tissue important for the body ?
what is the function of epithelial tissue ?
what are some characteristics of epithelial tissue ?
Name an effective protective barrrier ?
what do you think the epithelial tissue is for ?
what are the epithelial tissues mentioned in part 2 ?