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Our body contains a large number of cells ‘L’ which are the longest cells in the body. L has long and short branch called as ‘M’ and ‘N’ respectively. There is a gap ‘O’ between two ‘L’ cells, through which nerve impulse transfer by release of chemical substance ‘P’.

i. Name the cells L.
ii. What are M and N?
iii. What is the gap O?
iv. Name the chemical substance P.
 
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