What is the difference between responsibility and accountability?

In writing my blook on Conversational Leadership, I often find myself researching and defining the meaning of words or concepts and their nuances.

For example, we use the words responsibility and accountability loosely in everyday language, but what is the difference?

This is my best attempt so far in answering that question. But in summary:

We can only choose to take responsibility for something. No one else can assign responsibility to us.

We take responsibility but are held accountable.

Any feedback you may have is most welcome.