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BIOLOGY CELL SIGNALING QUESTION!!? PLEASE HELP!What are some situations where it would be necessary for signal transduction to occur very rapidly?

What are some situations where it would be necessary for signal transduction to occur very rapidly? 
 
I know that signal transduction is essentially a process by which a cell converts one kind of signal or stimulus into another, and it ultimately converts a stimulus to a specific response in the cell. And it can be done by either a kinase cascade or second-messenger pathway (I don't think I fully understand either of those). 
 
Would signal transduction need to occur rapidly in order for a cell to respond to too much glucose and produce insulin? This is a shot in the dark. If not, what are some other situations? 
 
Thank you so much for the help!
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In order to survive, organisms must constantly adjust their internal state to changes in the environment. organism must receive signals to track these changes. These may be in the form of chemicals (hormones, neurotransmitters, nutrients) or may take another form, such as light, heat, or sound. A signal itself rarely causes a simple, direct change inside the cell. Instead, the signal sets off a chain of events that may involve many steps. The signal is thereby transduced, or changed in form. Signal transduction refers to the entire set of pathways and interactions by which environmental signals are received and responded to by single cells.
 
For example, prokaryotic organisms have sensors that detect nutrients in the environment and help them navigate toward their food. In multicellular organisms, hormones, neurotransmitters, and extracellular matrix components are some of the many types of chemical signals cells use. The hormone epinephrine sets off the fight-or-flight response causing increased sweating, anxiety, metabolism and heart rate. This needs to happen very quickly in order to avoid danger.

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There are many examples you can use. Think about what happens when you walk outside without a coat on in the middle of winter. The temperature sets off a chain of events that leads to different cellular reactions like shivering (muscle contractions) and increased metabolism (glucose production/release in liver) in order to maintain body temperature.