Connective Tissues Most diverse abundant tissue Main Role
Connective Tissues Most diverse & abundant tissue
Main Role n Strength against forces n Protect organs n Maintain organ shape n Provide frame for muscle pull
2 Components n Cells + matrix ¨Cells ¨Matrix ~ ground substance n. Fibers + “Protein Glue” + Water n. Non-living
Origin of Connective. Tissue Just notice that the cells, thus tissue, thus system originates from the mesoderm, as you learned previously
Connective Tissue Cells n Fibrocyte n Chondrocyte n Osteocyte n Hematopoietic stem cell (in bone marrow) red blood cell makers
Types of Fibers n Reticular keeps cells in place n Collagen resists stretch n Elastic allows stretch
Tissues Described By : n Amount of fibers : # of cells n Arrangement of fibers in matrix n Type(s) of fiber in matrix n Ability, function or location
Types ¨Connective ¨Cartilage ¨Blood ¨Bone proper
Connective Tissue Proper (1/4) Loose few fibers : more cells
Loose & Adipose Fiber type: almost none Function: Energy storage, protection n Location ¨Under skin ¨Around organs ¨Behind eyeballs ¨Fastens kidneys
Loose & Reticular Fibers: reticular Function: scaffold for cell migration Location: lymph organs Lymph nodes bone marrow spleen
Loose & Areolar Fiber Type: Function: collagen, reticular, elastic retains water; connects epithelium to …? Location ¨Under epithelia ¨Around organs ¨Surround capillaries
Connective Tissue Proper (1/4) Dense more fibers : few cells
Dense & Regular n Description ¨Parallel direction ¨collagen & some elastic fibers ¨High stretch strength ¨Poor vascular supply Function ¨stress in one direction n Location ¨Tendons & ligaments ¨Bundle ends of muscles n
Dense & Irregular Description ¨Multi direction ¨collagen & elastic fibers ¨Resist stretch n Function ¨Withstand tension ¨structural strength n Location ¨Dermis of skin ¨digestive tract ¨joints and organs n
Dense & Elastic n Description ¨ Elastic fibers, very little collagen ¨ High elasticity n Function ¨ n Allow stretch Location ¨ Alveoli of lungs ¨ Arteries
*Cartilage 3 types n Description ¨Avascular, no nerves ¨Matrix up to 80% water n (1/4)
A. Hyaline (Glassy) Description ¨ a few collagen fibers n Function ¨Resist repetitive stress ¨Support & reinforce ¨cushion n Location ¨End of long bones ¨Costal cartilage of ribs ¨nose, trachea, & larynx n
B. Elastic Description ¨More elastic fibers ¨A Few collagen n Function ¨Maintain shape ¨Great flexibility n Location ¨external ear ¨Epiglottis n
C. Fibrous n Description ¨Thick collagen fibers n Function ¨Tensile strength ¨Absorb compression n Location ¨Intervertebral discs ¨Pubis symphysis ¨Disc of knee joint
*Blood Tissue n Description ¨Cells + fluid matrix + dissolved fibers Function ¨transport gases, nutrients, & waste n Location ¨blood vessels n (1/1)
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