Q.
        Refer to the given diagrammatic representation of the mechanism of action of a protein hormone.
 

 
In which of the following options correct labelling of $A$, $B$ and $C$ is given? 
 
  
  
  
   
 A  
 B  
 C  
   
  
  
 
 (a)$\,\,$  
 Generation of second messenger$\,\,$  
 Physiological responses$\,\,$  
Biochemical responses  
   
 
 (b)$\,\,$  
 Activation of genes$\,\,$  
 Biochemical responses$\,\,$  
Generation of second messenger  
   
  
 (c)$\,\,$  
 Generation of second messenger$\,\,$  
 Biochemical responses$\,\,$  
Physiological responses  
   
  
 (d)$\,\,$  
 Biochemical responses$\,\,$  
Activation of genes$\,\,$  
 Physiological responses  
   
  
 
 
      | A | B | C | |
|---|---|---|---|
| (a)$\,\,$ | Generation of second messenger$\,\,$ | Physiological responses$\,\,$ | Biochemical responses | 
| (b)$\,\,$ | Activation of genes$\,\,$ | Biochemical responses$\,\,$ | Generation of second messenger | 
| (c)$\,\,$ | Generation of second messenger$\,\,$ | Biochemical responses$\,\,$ | Physiological responses | 
| (d)$\,\,$ | Biochemical responses$\,\,$ | Activation of genes$\,\,$ | Physiological responses | 
          Chemical Coordination and Integration
          
        
      Solution: