epithelial tissue

Epithelial Tissue

Lining tissue to create protective barriers. Controls permeability, provides sensation, and specialized secretion.

Connective Tissue

Protects and gives structure to other tissues and organs in the body.

Muscle Tissue

Tissues that allow for movement in the body.

Nervous Tissue

Tissue that acts as the body’s control center and coordinates daily human functions.

Epithelia

Layers of cells covering internal or external surfaces

Glands

Structures that produce secretions

Cellularity

Cells bound closely together by cell junctions

Apical polarity in a cell is…

the top or "free" surface of the cell. It faces an open space such as a body cavity (lumen) or the external environment.

Basal polarity in a cell is…

the bottom surface of the cell, which is attached to the basement membrane.

Avascularity means that..

a tissue has no direct blood supply. Gets its blood from tissues nearby

Epithelial cells regenerate very often because…

they are abused/ on the outside of things.

Tight Junctions…

located between plasma membranes, uses proteins to make a tight barrier preventing substances from passing between cells.

Desmosomes…

Link cells to other proteins. Made of a web of filaments anchored across cells, each cell completes one half of the structure

Gap junctions..

allow rapid communication as ions and small molecules pass between cells. allows coordinated activities so tissues can work as a whole.

Epidermis

Outmost layer of skin

Dermis

Lower layer of skin

Squamous epithelia…

are thin and flat

Cuboidal epithelia…

are square shaped

Columnar epithelia..

are tall, slender rectangles

Simple epithelium…

are a single layer of epithelial cells

Stratified epithelium…

are several layers of cells

Simple squamous tissue is useful for when substances need to diffuse/filter/secrete _________ the tissue

across

Simple squamous tissue is common in…

The lungs, blood vessel lining, and membranes of the body cavities

Simple cuboidal cells are useful for…

absorption, secretion and glands/ducts

Simple cuboidal cells are common in…

the thyroid gland, ovary surface, kidney tubules, ducts of glands.

most of our simple columnar cells are…

ciliated (cilia)

Simple columnar cells are useful for..

secretion of mucin, and movement of oocyte through uterine tube.

Simple columnar cells are usually found in the…

digestive tract (non-ciliated), bronchioles (ciliated), and uterine tubes (ciliated)

Goblet cells are..

mucus making cells

cilliated pseudostratified columnar cells..

move mucus across a membrane by the use of cilia

Stratified cuboidal cells are common in…

ducts of exocrine glands, male urethra, and ovarian follicles.

Stratified Squamous cells are what make up our..,

skin

Non- Keritanized Stratified Squamous are…

Alive and kept moist

Keritanized stratified squamous cells are…

the outermost cells, are non living filled with protein called keratin. strong but toxic.

Transitional Epithelia are…

Round when relaxed, flattened when stretched. stretching and relaxing. lines urinary tract.

Endocrine glands…

release hormones into interstitial fluid, no ducts

Exocrine glands

produce secretions onto epithelial surfaces through ducts. ex: sweat

Goblet cells are located…

within epithelial tissues

Membrane junctions…

connect and support cells, and are located in between cells that are next to each other.

epithelia are replaced by the division of…

stem cells

Ciliated pseudostratified columnar tissues are common in the…

larger airways of the respiratory tract

most glands are…

multicellular

Merocrine glands…

produce watery secretions ex: saliva, sweat

Apocrine glands…

produce milky/waxy secretions ex: breast milk, ear wax

Holocrine/Sebacious Glands…

produce oily secretions