The outer living boundary of the cell is called as the cell membrane or ‘Plasma membrane’. The term cell membrane was coined by C.J. Nageli and C. Crammer in 1855. Apart from the cell membrane, each and every organelle in the cell is also covered by membranes. The cell membrane not only limits the cell cytosol, but it has a variety of functions like membrane transport, signal transduction and neuro transmission.
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