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.
Osmosis is the movement of water molecules from an area of high water concentration (weak/dilute solution) to an area of low water concentration (strong/concentrated solution) through a partially permeable membrane.s we know each cell is surrounded by a cell membrane. This membrane has tiny holes in it which allow small molecules to pass through but not large ones. Due to this nature the cell membrane is described as being partially (or selectively) permeable. Osmosis is a special kind of diffusion involving water molecules.