Permanent Tissues in Animal

                                                         Permanent Tissues in Animals

These permanent tissues in the animal cells  can be divided into 4 different type of  tissues.

• Epithelial Tissues
• Muscular Tissues
• Connective Tissues
• Nervous  Tissues

Epithelial Tissues  : Simplest, protective ,tightly ,packed ,and forms a continuous sheet.contain little or no intercellular space.These tissues  lie on a delicate non-cellular basement membrane which contains a special form of matrix protein called Collagen

Function: Protect the cells from bacterial and viral infection.

                               perform secretary function

                               elimination of waste material   

         Types:      

• Squamous Epithelium: (thin,flat,irregular shaped cells)(lining of cavities,blood vessels,covering of tongue and skin)
• Cuboidal Epithelium: (found in kidney tubules,thyroid vesicles and in glands)
• Columnar Epithelium : (main function is absortion and secretion )
• Glandular Epithelium: these are modified to form glands which secrete chemicals.
• Ciliated  Epithelium : found in trachea,bronchii, kidney tubles,oviduct and sperm ducts.

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Muscular Tissues  :   They are elongated,large-sized,they are contractile tissue,movement of body parts  takes place just because of them.On the basis of their location,structure and function they can be classified into three type:  

 Types: 

1)  Striated muscles               2)  Smooth muscles            3) Cardiac muscles                    (striped muscles,voluntary)          (unstriated, involuntary)       (branched fibres,intercalated                                                                                                                   discs)

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Connective Tissues : These are specialised to  connect and anchor various body organs.Main function of these tissues are binding,supporting and packing.Homogenous gel like intercellular substance called matrix (contain GAG glycosaminoglycans or mucopolysaccharides )forms  the main bulk of the connective tissues.

Types:   

• Areolar Loose Connective Tissues:(Its matrix is made up of two      kinds of fibres White Collagen fibres and Yellow elastic fibres or elastin)
• Dense Regular Connective Tissues: (Tendons and Ligaments)
• Adipose  Connective Tissues:(basically an aggregation of fat cells)
• Skeletal Connective  Tissues : (Cartilage and Bone)
• Fluid Connective Tissues: (Blood and Lymph)

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• Nervous Tissues: These are  specialised to trasmit messages in our body.brain,spinal cord and nerves are all composed of nervous tissues.They contain highly specialised cell called neurons.Each neuron is made up of  Cyton, dendrons and axon.

          Function: The dendrites receive impulses and the axon takes impulses away from the cell body.