In which stage does the brain become much more active, and heart rate, blood pressure, and respiration's shift up and down, sometimes extremely?

Brian said that when you get your body broken such as a arm or leg. it means your bones break to pieces and must do surgery or get a cast to fix it.is it true or false?

Energy needs, in total kilocalories per day, are greater during than any other time of life. a.childhood b.infancy c.adulthood d.adolescence

How can the stress response be used in a way. for example to build resilience.