Why a Chest Tube is Placed. A chest tube is placed for a variety of reasons. One reason, as you mentioned, is to help the lung re-inflate when someone has a collapsed lung, also known as a pneumothorax. In that circumstance, a chest tube is inserted along the side of the ribs to allow the lung to reinflate.
A. Osmosis is the passive movement of water from an area high in water concentration, across a semi-permeable membrane, to an area low in water concentration.
passive transport. the movement of particles from areas of high concentration to lower concentration and does not require any energy; can be described when someone is going down a hill, from high to low, and they do not need energy because they are just coasting; examples of passive transport are osmosis and diffusion.