Emergency services at the scene of an accident where a woman was killed by a falling tree

What does the phrase 'you OK?' imply in a conversation?

In what contexts might someone ask 'you OK?' and why?

How can the tone of voice affect the meaning of 'you OK?'?

What are some possible responses to the question 'you OK?'?

Why is it important to check in on someone's well-being with questions like 'you OK?'?