What are the four types of tissues?
- Epithelial
- Connective
- Muscle
- Neural
What are the functions of Epithelial tissue?
- Protect surfaces
- Control permeability
- Provide sensation
- Secretion-> glandular epithelium
What are the two layers of the Basal Lamina?
- Lamina lucida- connected to the epithelial cell
- Lamina densa- deeper layer attached to the underlying connective tissue
What is mesothelium?
Used to describe the simple squamous epithelium that lines the anterior body cavities
What is Endothelium?
Describes the simple squamous epithelium lining the inner chambers of the heart and inner most layer of blood vessels
What are the 6 characteristics of epithelial tissue?
- Polarity
- Cellularity
- Basal Lamina
- Avascularity
- Arranged in sheets
- High mitotic rate
Where is simple epithelium found in the body?
- In protected areas inside of the body-> thoracic, abdominal, pelvic cavities, chambers of the heart, and ALL blood vessels
- Also found where secretion, absorption, or filtration occurs-> the lining of the intestines and gas exchange surfaces of the lungs
Where is stratified epithelium found in the body?
- Occur in areas where mechanical or chemical stresses are severe-> the surface of the skin and the lining of the oral cavity
Where are simple squamous epithelium found?
- Mesothelia lining pleural, pericardial, and peritoneal cavities
- Endothelia lining heart and blood vessels
- Portions of kidney tubules
- Inner lining of cornea
- Alveoli of lungs
What are the functions of simple squamous epithelium?
- Reduces friction
- Controls vessel permeability
- Performs absorption and secretion
Where are stratified squamous epithelium found?
- Surface of skin
- Lining of oral cavity, throat, esophagus, rectum, anus, and vagina
What are the functions of stratified squamous epithelium?
Provides physical protection against abrasion, pathogens, and chemical attack
Where are simple cuboidal epithelium found?
Glands; ducts; portions of kidney tubules; thyroid gland
What are the functions of simple cuboidal epithelium?
- Limited protection
- Secretion
- Absorption
Where is stratified cuboidal epithelium found?
Lining of some ducts (RARE epithelia)
What are the functions of stratified cuboidal epithelium?
- Protection
- Secretion
- Absorption
Where is simple columnar epithelium found?
Lining of stomach, intestine, gallbladder, uterine tubes, and collecting ducts of kidneys
What are the functions of simple columnar epithelium?
- Protection
- Secretion
- Absorption
Where is stratified columnar epithelium found? (RARE)
Small areas of the pharynx, epiglottis, anus, mammary glands, salivary gland ducts, and urethra
What is the function of stratified columnar epithelium?
Protection
Where is pseudostratified ciliated columnar epithelium found?
- Lining of nasal cavity, trachea, and bronchi
- Portions of male reproductive tract
What are the functions of pseudostratified ciliated columnar epithelium?
- Protection
- Secretion
Where is transitional epithelium found?
- Urinary bladder
- Renal pelvis
- Ureters
What are the functions of transitional epithelium?
Permits expansion and recoil after stretching
