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Detailed Table of the Chapter 7 Notes – Structural Organisation in Animals Class 11 Notes PDF
|5.||Chapter||Biology chapter 7|
|6.||Chapter Name||Structural Organisation in Animals|
|7.||Category||CBSE Revision Notes|
Structural Organisation in Animals Class 11 Notes PDF
Tissue: A group of similar cells along with intercellular substances which perform a specific function.
Simple epithelium: is composed of a single layer of cells resting on a basement membrane.
Compound epithelium : consists of two or more cell layers and has protective function.
Areolar tissue : is a type of loose connective tissue present beneath the skin.
Adipose tissue : is a type of loose connective tissue which has cells specialised to store fats.
Neuroglia : A delicate connective tissue which supports and binds together the nerve tissue in the Central Nervous Tissue.
Malpighian tubules : Yellow coloured thin, filamentous tubules present at the junction of midgut and hindgut in cockroach; helps in excretion.
Uricotelic : Animals which excrete nitrogenous waste in the form of uric acid.
Tight junctions : Plasma membranes of adjacent cells are fused at intervals. They help to stop substances from leaking across a tissue.
Adhering junctions : Perform cementing function to keep neighbouring cells together.
Gap junction : Facilitate the cells to communicate with each other by connecting the cytoplasm of adjoining cells for rapid transfer of ions, small molecules and sometimes big molecules.
Made of more than one layer of cells.
• Provide protection against chemical and mechanical stresses.
• Cover dry surface of the skin, moist cavity, pharynx, the inner lining of ducts of salivary glands and pancreatic ducts.
Structural Organisation in Animals Class 11 Notes PDF – Animal Tissue
Loose Connective Tissue (has cells and fibers loosely arranged in semi-fluid ground substance)
(i) Areolar Tissue :
• present beneath the skin.
• contains fibroblasts, macrophages and mast cells.
• serves as a support framework for epithelium.
(ii) Adipase Tissue :
• located beneath the skin.
• cells are specialised to store fats. Dense Connective Tissue Fibres and fibroblasts are compactly packed.
(i) Dense Regular :
• Collagen fibres present in rows.
• Tendons attach skeletal muscle to bone.
• Ligaments attach bone to bone.
(ii) Dense Irregular :
• Has collagen fibres and fibroblasts oriented differently.
• This tissue is present in the skin. Specialised Connective Tissue
(i) Cartilage made up of chondrocytes and collegen fibres.
(ii) Bones Ground substance is rich in calcium salts and collegen fibres Osteocytes are present in lacunae
(iii) Blood Fluid connective tissue, consists of plasma and blood cells Muscle Tissue Consists of long, highly contractile cells called fibres; bring about move- ment and locomotion.
(i) Skeletal Muscle :
• Consists of long cylindrical, multinucleated fibres.
• Closely attached to skeletal bones.
(ii) Smooth Muscles :
• Consists of spindle like, uninucleated fibres.
• Do not show striations.
• Wall of internal organs such as blood vessels, stomach and intestine.
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