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- Groups of similar cells with identical functions
- 4 types
What are the 4 types of tissue?
Where is epithelial tissue found? Are they secretory?
What are the 3 types of epithelial tissues?
- Exocrine glands
- endocrine glands
- epithelial linings
Describe exocrine and endocrine glands
-Are they ducted or ductless?
Exocrine glands--ducted; ex. sweat, salivary, liver, pancreas
- Endocrine glands--ductless; ex. hormones
- -uses bloodstream for delivery
Describe epithelial linings
- line outer and inner surfaces
- thin and weak
- underlain by basement membrane (connective tissue)
- no vessels or nerves
- Ex. Epidermis (skin)
Epithelial lining is categorized by 2 things:
-What are those 2 things?
-what is the criteria for each of those categories?
- # of cell layers
- -simple: 1 layer
- -stratified: >1 layer
- -pseudostratified: simple, but appears stratified
- --always columnar, usually ciliated
- Cell shape:
- --Ex. transitional epithelial or urinary bladder
Where do you find these types of epithelial cells?
- Simple squamous--capillaries, alveoli, glomeruli
- Simple columnar--most organs of the digestive tract (ex. stomach, small & large intestine)
- Simple cuboidal--surface of ovaries, lining of nephrons, parts of the eye and thyroid
- Stratified squamous--outermost layer of skin, inner lining of mouth, esophagus and vagina
Describe connective tissue:
-where is it found?
-what does it do?
- All over body
- mostly binds and supports
- A few living cells in a matrix (surrounding environment)
The matrix is composed of 2 things:
- protein fibers
- ground substance
What protein fibers are in the matrix?
- Collagen--white fibers, unbranched, tough
- Elastin--yellow, branched, & elastic
- Reticulin--black, branched, tough
what are examples of ground substance in the matrix?
- blood (WBC's and plasma)
What are the 7 types of connective tissue?
- dense fibrous
Describe areolar connective tissue
- loose fibers in a soft gel
- "packing material"
- lines major vessels & nerves--supports them during articulation
- 2nd line of defense against infection
Explain how areolar connective tissue is the second line of defense against infection
- underlies the skin (first line of defense)
- full of macrophages--activated when infection arrives and seeks bacteria
Describe adipose connective tissue
-what 3 things make up this cell?
- Fat cell
- consists of adipocytes in loose fibers
- larger than other cells
- composed of cytoplasm, nucleus, and fat vacuole
Describe reticular connective tissue
- supports parenchyma (soft tissue)
- stroma--dense fibrous support composed of reticulin for soft organs (liver, spleen)
What are the 3 types of dense fibrous connective tissue?
What are examples of elastic dense F.C.T?
- mostly elastin
- Ex. lungs, arteriole walls
Explain regular dense F.C.T
- Mostly collagen (unbranched)
- fibers are parallel
- Ex. tendons and ligaments
Explain irregular dense F.C.T
- mostly collagen (unbranched)
- fibers are randomly arranged
- Ex. pericardium (fat around heart), dura mater, heart valves, and sclera (whites of eyes)
What are the 3 types of cartilage?
- hyaline cartilage
- elastic cartilage