In skeletal muscle cells, 

a low cytosolic Ca+2 level is maintained by a unique Ca+2 ATPase that continually pumps Ca+2 ions from

the cytosol containing the myofibrils into the SR, establishes a reservoir of Ca+2 in the SR.

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Classification of peteridophytes

II.LYCOPODOΡΗΥΤΑ (CLUB MOSSES)

Eg: Lycopodium, Selaginella

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Classification of peteridophytes

III.EQUISETOPHYTA (HORSE TAILS)

 Eg: Equisetum

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Classification of peteridophytes

IV.  Filicophyta(Ferns)

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IV. Gymnosperm

non-flowering plants

Naked seeds (fruits are not produced)

Heterosporous- life cycle

Better adaptation for land habitat

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IV.Gymnosperm

Fertilization- Siphonogamous

Shows secondary growth- due to cambium

Seeds are borne on cones

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IV.Gymnosperm

They are perennials and woody plants

They bear tap roots

Ovules - Orthotropous & covered by single integument