Essay About Structure Of The Main Tissues Of The Body And Simple Epithelial Tissuesquamousone Cell

Structure of the Main Tissues of the Body and Their Role
P2 Describe the structure of the main tissues of the body and their role.Tissue groupSub-type of tissueStructure (image plus a few words)Function (what does it do)Where it can be found and what it does there (2 examples)Simple epithelial TissueSquamousOne cell thick on basement membrane. FlatAllows substances to pass through e.g. O2 and CO2Alveoli, capillary wallsCuboidalOne cell thick on basement membrane. Square.Secretion and absorptionKidney tubules, ducts of glandsColumnarOne cell thick on basement membrane. ColumnsProduce secretionsLining of the upper airwaysCiliatedOne cell thick. Column with ciliaMove secretionsLining of upper airwaysStratified Squamous epitheliumKeratinisedMultiple layers. Contains keratin in the upper layers.Protects, tough, water proof, protects against bacteriaSkinNon-keratinisedMultiple layers. Does not contain keratin in the upper layersProtects, quite tough, protects against bacteriaoesophagusConnectiveAreolarCells are spaced in-between fibres of elastin and collagen. Fat cells are present in the tissue.Collagen provides structure and firmness to tissue. Elastin make. the tissue flexible.Throughout the body e.g. skinAdiposeSimilar to areolar with more fat cellsProtects and insulatesAround main organsBone tissueMade up of osteocytes (bone cells). There is spongy and dense bone tissue. Well supplied by blood vessels.Support, protection and facilitates movementSkull, sternumCartilageCells more widely spaced and there are 3 main types. More flexible than bone.Support and flexibilityNose and earsBloodPlasmaRBCsWhite blood cellsPlateletsNutrientsMuscle TissueSmoothSpindle shaped cells arranged in sheetsContracts and relaxes to create movement not under conscious controlGastrointestinal tractStriatedElongated cell fibres running parallel to each other arranged in bundlesContracts and relax to create movement under conscious controlBicepsCardiacMuscle fibres are interconnected, contain multiple nuclei, unconscious controlPumps bloodHeartNervous TissueNeurones (motor neurones and sensory neurones)