Structural Organisation in Animals

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Striations

Nucleus

Striations

Nucleus

Intercalated discs

Skeletal/striated

Smooth

Cardiac

Smooth

muscle

fibres

SKËLËTÅL (STRÏÅTËD ØR VØLÜÑTÅRÝ) MÜSÇLË

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They are attached to skeletal bones. E.g.

Biceps.

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Striations are present in muscle fibres.

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Muscle fibres are bundled together in a

parallel fashion.

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A sheath of tough connective tissue

encloses several bundles of muscle fibres.

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SMØØTH (ÑØÑ-STRÏÅTËD ØR VÏSÇËRÅL) MÜSÇLËS

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Involuntary and fusiform (fibres taper at both

ends).

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No striations.

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Cell junctions hold them together and they are

bundled together in a connective tissues sheath.

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They are seen in the wall of internal organs such

as the blood vessels, stomach and intestine.

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