Flashcards in Epithelia, Glands And Skin Deck (46)
Where are Mucous membranes?
line internal tubes which open to the exterior e.g. respiratory tract
What are Mucous membranes made from?
epithelium, lamina propria (adjacent layer of connective tissue), muscular mucosae (alimentary tract made of smooth muscle)
What are Serous membranes?
thin, two part membranes that line certain body cavities, secrete lubricating fluid for friction free movement e.g. peritoneum
What are Serous membranes made from?
Simple squamous epithelium (secretes lubricating fluid) and a thin layer of connective tissue
How do the heart, lungs and gut become surrounded by serous membrane?
develop next to bag like cavities when embryo and invaginate so become surrounded
What are Epithelia?
sheets of contiguous cells that cover the external surface of the body and line internal surfaces
What does simple epithelia mean?
one cell layer
What does stratified epithelia mean?
more than one cell layer
What is the function of simple squamous cells?
active transport by pinocytosis
Where are simple squamous cells?
Air sacs of the lungs, blood and lymph vessels, kidney, lining of body cavities
What is the function of simple cuboidal cell?
Secretes and absorbs, barrier and hormone synthesis in thyroid
Where are simple cuboidal cells found?
in ducts and secretory portions of the small glands, thyroid follicles and kidney tubules, ovary
What is the function of simple columnar cells?
Secretes mucous and enzymes, lubrcation, transport
Where are simple columnar cells found?
ciliated tissues in bronchi, uterine tubes, uterus and non ciliated in digestive tract and bladder
What is the function of pseudosatisifed columnar epithelium?
Secretes mucus, ciliated move mucus
Where are pseudosatisifed columnar epithelium found?
Trachea and upper respiratory tract
Where are Stratisfied squamous epithelium found
Lines the esophagus, mouth and vagina
What is the function of stratified squamous epithelium?
protects against abrasion, reduces water loss
What is the function of stratified cuboidal epithelium?
Where are stratified cuboidal epithelium found?
Sweat glands, salivary glands and mammary glands
What is the function of stratified columnar epithelium?
Secreted and protects
Where is stratified columnar epithelium found?
The male Urethra and ducts of some glands
Where is transitional epithelium and what is its function?
Allows urinary organs to expand and stretch e.g. bladder, urethra and ureters
What are squamous cells shaped like?
Cells are wider than there height
What are cuboidal cells shaped like?
Height and width are the same
What are columnar cells shaped like?
Height is greater than width
What is the basement membrane?
Strong flexible layer what the epithelial cells adhere to
What type of cell forms the skin epidermis?
Keratinised stratified squamous epithelium
What are the four layers of the epidermis?
Prickle cell layer