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Cover exposed internal and external surfaces; Line internal vessels, passageways, and cavities; Form glands and produce secretions.
Fill in void spaces
Provide structural support to cells, tissues, and organs
Provide a location to store energy
Contractile to produce movement or to propel liquids
Maintains body's correct posture
Assists in maintaining body temperature
Carries information to organ / tissue systems
Conducts electrical impulses
Responsible for sensory and motor function
functions of epithelial tissue
1. Provide physical support: Protect against physical, chemical, and biological agents
2. Control permeability
Any substances that enters the body (or an organ) must pass through an epithelium
3. Form glandular tissue and produce specialized secretions
4. Highly specialized epithelium - neuroepithelium provide sensations
polarity of epithelial tissue
apical surface (outermost) and basal surface (attached to other tissues) are characteristically different, as well as distribution of contents
avascularity of epithelial tissue
no blood vessels. nutrients obtained by diffusion or absorption from apical or basal surfaces
located on apical surface of most epithelial tissues. increase surface area by 20x, help in absorption and secretion
product release from surface or via a duct, cells polarized. further classifications: single cell, multiple cells, simple/complex duct
no ducts, no polarization, produce HORMONES, which are easily diffusable into blood stream
function of connective tissue
1. Protecting and supporting surrounding tissues
2. Interconnecting tissues
3. Establish structural framework
4. Store energy (lipids)
5. Transporting liquids throughout circulatory / lymph systems
6. Defending body from infections or other harmful substances
blood, lymph. Refers to distinct population of cells suspended in watery matrix containing dissolved proteins
fixed second most abundant cell type; found in all connective tissue proper; maintain the fibers of connective tissue proper
fixed stem cells of CT. respond to local injury, and can differentiate into other CT cells
loose CT proper
types: areolar tissue, adipose tissue, reticular tissue. the "packing material" of the body. fill spaces between organs, provide cushioning, and support epithelia. around blood vessels and nerves, store lipids, and let things diffuse through it.
most widely distributed connective tissue, it is soft, pliable and "cobwebby", it cushions and protects body organs, holds other tissues together, fills in spaces
tissue with such high abundance of adipocytes that it loses resemblance of areolar CT. white fat and brown fat
long, straight, and unbranched; most common fibers in connective tissue proper; flexible; tendons and ligaments
very thin highly branched fibers found in connective tissue, provide delicate support of organs, and stabilize the positions of functional cells
Long threads made of the protein elastin. provide a rubbery quality to the extracellular matrix that complements the nonelastic strength of collagenous fibers.
contains reticular fibers, macrophages, fibroblasts, fibrocytes. stroma of spleen, lymph nodes, and bone marrow
dense regular CT
collagen fibers packed tightly and aligned parallel to applied forces. ex: tendons, aponeuroses, elastic tissues, ligaments
a subset of dense CT proper; large numbers of elastic fibers, giving it a springy nature so it can withstand cycles of expansion and contraction. found between vertebrae of spinal column
fluid CT containing red blood cells/erythrocytes (transport oxygen), white blood cells/leukocytes (immune system), platelets (enzymes for clotting)
most common cartilage. tightly packed collagen fibers, but weakest. ex: btwn sternum and ribs, support of respiratory tract, articular cartilages. white color in the body
cartilage with little ground substance that lies in areas of high stress. ex: btwn vertebrae, meniscii of kneww joint
cartilage that contains elastic fibers, making is resilient and pliable. ex: external ear, cartilages of the larynx...nose??
separates cartilage from surrounding tissues. makde of two layers, an outer fibrous layer, and an inner cellular layer
a firm gel that contains chrondroitin sulfates which form proteoglycans. chrondrocytes live in lacunae chambers of water matrix.
a muscle that is connected at either or both ends to a bone and so move parts of the skeleton
a muscle that contracts without conscious control and found in walls of internal organs such as stomach and intestine and bladder and blood vessels (excluding the heart)
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