Glossary


 

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O

Organelles

specialised structures inside a cell


Organic

derived from living matter


Osmoregulation

the maintenance of the optimal water concentration within the bloodstream 


Osmosis

the movement of water molecules from an area of low concentration to one of high concentration, through a semipermeable membrane


Ossification

the process of bone formation


Osteoblast

a cell that secretes the substance of bone


Osteochondrosis

disease of the growth ossification centres


Osteoclast

a cell that breaks down bone tissue


Osteocyte

bone cell


Outer envelope

the protective layer surrounding a virus



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