The pleurae produce pleural fluid and create cavities to separate major organs and reduce friction during breathing, but they do not assist in blood flow to and from the heart.
The role of the pleurae includes producing pleural fluid to lubricate the surfaces of the lungs and assisting the lungs to glide easily during breathing movements. It also creates cavities that separate the major organs which help limit the spread of local infections and ensure that their movement does not interfere with each other. However, assisting in blood flow to and from the heart because the heart sits between the lungs is not a function of the pleurae. Therefore, the correct answer to which of the choices below is NOT a role of the pleurae is option B) assist in blood flow to and from the heart because the heart sits between the lungs.