Lab Exam 1 Flashcards
What are the functions of epithelial tissues?
- Protection
- Absorption
- Filtration
- Excretion
- Secretion
- Sensory reception
What characteristics distinguish epithelial tissues from other types?
- Polarity:
- Specialized contacts- cells fit closely together to form sheets of cells
- Supported by connective tissue- cells are attached to basement membrane
- Avascular but innervated- supplied by nerves but have no blood supply of their own
- Regeneration: can easily divide to regenerate tissue
What are the functions of simple squamous epithelium?
Allows material to pass by diffusion and filtration in sites where protection is not important; secretes lubricating substances in serosae
Where are the simple squamous epithelium found?
Kidney glomeruli; air sacs of lungs; lining of heart, blood vessels, and lymphatic vessels
What function do simple cubodial epithelium have?
Secretion and absorption; function of glands
Where are simple cubodial epithelium found?
Kidney tubules, ducts and secretory portions of small galnds, ovary surface
What are the functions of stratified squamous epithelium?
Protects underlying tissues in areas subjected to abrasion
Where are stratified squamous epithelium located?
Nonkeratinized forms: esophagus, mouth, and vagina
Keratinized froms: forms epidermis of skin
What are the functions of stratified cuboidal epithelium?
Protection
Where are the stratified cuboidal epithelium located?
Largest ducts of sweat glands, mammary glands, and salivary glands
Where is stratified columnar epithelium located?
Rare in body; small amounts in male urethra and in large ducts of some glands
What are the functions of stratified columnar epithelium?
Protects and secretes
Where is transitional epithelium located?
Lines the ureters, urinary bladder, and part of urethra
What are the functions of the transitional epithelium?
Stretches readily and permits distension of urinary organ by contained urine
What is the embryonic connective tissue called?
Mesenchyme; gives rise to all other connective tisse types