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Animal cell specialisation (Epithelial tissues (Function (Protection,…
Animal cell specialisation
Nerve tissues
Made up of neurones
Highly specialised
Structure
Cell body
Axons
Send message away from cell body
Enclosed in a myelin sheath
Formed from Schwann cells
Funtion:protect and as electrical insulation in neurone (accelerates impulse transmission
Transmission speed is further increase by nodes of ranvier
Dendrites
Send message to cell body
Entire neurone is enveloped by a thin and tough protein(neurilemma)
Epithelial tissues
Characteristics
Closely packed cell
May arranged in single/multi-layer
Function
Protection
Cover organs surface
Cover body surface
Absorption
Secretion
Some specialised to form sensory receptor
Type
By number of layer
Stratified
More than one layer
Pseudostratified
Single layer but appearing as more than one layer
Simple
Single layer
By shape of cell
Squamous
Flattened
Cuboidal
Cube shape
Columnar
Tall and thin
Muscle tissues
Form by muscle cells (muscle fiber)
Function
Produce movement
Type
Skeletal muscle
Striated, tubular, multinucleated
Attached to skeleton
Voluntary
Smooth muscle
Spindle shape, non striated
Occur in wall of internal organs
Involuntary
Cardiac muscle
Striated, branched, uninucleated fiber
Occur in walls of heart
Involuntary
Connective tissues