Every member in your team has a role to play. If one member does not live up to his or her responsibilities, the entire system suffers in the long run. Accountability means that you understand the role you play and understand its importance in the big picture of the organization. If you do not live up to your responsibilities, ultimately someone else will have to fill them for you.
If you consistently fail to perform, your job may be in jeopardy. Everyone is important in making the entire system work. Likewise, your team must hold one another accountable. Team members need to be willing to confront one another about behaviors and deliverables that do not conform to agreed-upon decisions. If you make a mistake face it. Accept responsibility and move on. The key is to accept responsibility for your mistake and try to avoid having it happen again.