Tissue Lab Flashcards
5 characteristics of epithelial tissue
- avascular (no blood vessels)
- tightly held by desmosomes
- polarity (apical & basal surface)
- rest on basement membrane and connective tissue
- lines and covers surfaces
What are the 4 types of tissues?
-connective, muscular, nervous, epithelial
What are the 2 kinds of epithelial tissues?
- covering/lining
- glandular
What are endocrine and exocrine glands?
- endocrine glands: ductless, produces secretes hormone into blood
- exocrine glands: with ducts, secretes chemicals out (like sweat glands)
Apical surface v basal surface
- apical: faces outside of an organ/inside of tube/passageway (the free surface)
- basal: separates the epithelium from underlying tissues. sits on basement membrane
5 functions of epithelial tissues
-diffusion, filtration, absorption, protection, secretion
Transitional epithelium
form over rounded cells with the ability to slide over one and another
How do you classify Epithelial tissue based on structure? (2)
Based on shape of cells
- squamous
- cuboidal
- columnar
Based on number of layers
- single
- stratified
- to identify stratified cells, look at the apical surface*
Simple squamous epithelium
3 functions, 5 locations
Function: filtration, absorption, secretion (of lubricating substances)
Location: kidney gromeruli, air sacs of lungs, lining of heart, lining of ventral cavity, blood/lymphatic vessels
Simple cuboidal epithelium
Functions: secretion, absorption
Locations: kidney tubules, ducts and secretory portions of small glands, ovary surface
What are the 4 types of connective tissues?
- Connective tissue proper (which includes fat and fibrous tissues of ligaments)
- blood
- bone
- cartilage
What are the 3 characteristics of connective tissue?
- originate from mesenchyme cells
- have cells and matrix
- varying degree of vascularity (vascularity bone>muscle>cartilage (avascular)
What are the 5 functions of connective tissue?
What is its main function (4)?
protection, support, movement, structure, transport
- binds and supports other cells.
- connective tissue consists largely of an extracellular matrix that separates the cells. this allows the connective tissue to bear weight, withstand tension, and endure physical abuses no other tissue can tolerate
- extracellular matrix, secreted by the cells
- the matrix consists of fibers embedded into a liquid, jelly, or solid material
What are the 3 types of fibers of connective tissue?
-collagen, elastic, reticular
What are the 7 different types of cells found in connective tissue?
- Mast cells - detect foreign microorganisms
- Adipocytes - fat storage
- Macrophages - devour foreiegn material
- Fibroblast - makes the CT proper
- Chondrocytes - cartilage cells
- Osteocytes - bone cells
- RBC, WBC, Platelets - blood cells
What are the 2 kinds of connective tissue proper? What are the 3 subdivisions for each?
- Loose connective tissue
- areolar: soft packing tissue that cushions and protects
- adipose: fat that provides storage & insulation
- reticular: reticular fibers containing collagen (similar to areolar but the only fiber it contains is reticular) - Dense connective tissue
- dense regular connective tissue: ligaments and tendons
- dense irregular ct: dermis (skin)
- dense elastic: large arteries
What is a cartilage tissue (2) and what are the 3 kinds of cartilage tissue?
- stands up to both tension and compression. in between bone and dense regular ct. rough but flexible
- avascular and relies on diffusion from blood vessels
- Hyaline: most abundant cartilages in the body, large number of collagen fibers
- tip of nose, ribs to sternum - Elastic: more elastic than hyaline
- external ear & epiglottis - Fibrocartilage: an intermediary between hyaline and dense regular ct
- intervertebral discs & spongy cartilages of knees
What are the fibers and cells of an Areolar Connective Tissue?
What is the function?
Where are they located?
- Fibers: collagen and elastic
- cells: fibroblasts
- location: under epithelium in lamina propria, surrounds capillaries
- function: provides cushion
What are the fibers and cells of dense regular connective tissues?
What are their location and functions?
- fibers: collagen
- cells: fibroblasts
- locations: tendons, ligaments
- functions: attach muscle to bones & bones to bones
What are the location and function of the dense irregular connective tissue?
- location: dermis
- function: protection
Dense elastic connective tissue
What are the fibers and cells?
What are the location and function?
- fibers: elastic
- cells: fibroblasts
- locations: large arteries
- function: allow stretching and recoil
Hyaline Cartilage
-fiber, cells, locations (4), functions (3)
- fiber: collagen
- cells: chondrocytes trapped in lacuna
- location: embryonic skeleton, ends of long bones, costal cartilage of ribs, nose/trachea/larynx
- function: support, reinforce, cushion