What makes people make such sacrifices to come out of retirement as a doctor or nurse, come to another state, leave their families and safety of their homes to help others?

What makes us who we are? Psychological scientists often approach this question differently, depending on whether they take a biological, learning, cognitive, or sociocultural perspective. How do these influences interact to make us who we are? Read textbook and watch the Diverse Perspectives video before answering these questions.
We have witnessed the bravery of so many people during this COVID19 Pandemic. What makes people make such sacrifices to come out of retirement as a doctor or nurse, come to another state, leave their families and safety of their homes to help others? You can also include the essential workers who continue to serve even after becoming affected and returning to work to help others and so many other examples of bravery that can be included.

How do some people become champion athletes despite having physical disabilities?

What causes someone to become anorexic, willing even to starve
themselves
to death?