What are the defensive tasks of midfielders?

Midfielders should mark opposing players and provide coverage and support to the defense.
They should also be able to intercept passes and recover the ball.
Midfielders should be able to perform double teams and coverages.
They should also be able to perform relays and exchanges with other midfielders and defenders.
Midfielders should be able to anticipate and read the opposing team's movements.
They should also be able to participate in defensive set pieces such as walls and barriers.