Question

how do you appreciate the function of a Tiny cell in a large body of organism

Answer 1

All cells even in a large organism are dependent on each other( For ex: cardiac cells , respiratory cells ). If few of them gets damaged functions of either nearby cells are affected spontaneously. 

Answer 2

A cell is the smallest building block of the body. A cell literally means ‘small room’ in Latin.  

The biological cells are small rooms containing all the essential components to sustain life. These include the genetic material DNA, RNA and proteins. Cells are equipped with all essential enzymes and machineries required for biological processes.  

Single cells put together form a tissue. So a functional tissue or organ is actually the readout of the functions performed by each single cell comprising it. In recent times single cell-based research has expanded to understand the function of a cell better.