6. See a doctor if the boil has not drained within two weeks, or has become infected. In some cases, medical treatment will be required to deal with the boil, due to its size, location, or infection. A doctor will need to lance the boil, either in his/her office or in surgery.
How do cells dispose of unwanted organic material? Although food has been broken down into individual molecules by the time it reaches a cell, cells still need to deal with larger complexes of organic material. Intracellular digestion is carried out by organelles called lysosomes. There are several contexts in which cells need to carry out digestion.
Since digestion occurs outside the cell, it is said to be extracellular. It takes place either in the lumen of the digestive system, in a gastric cavity or other digestive organ, or completely outside the body. The prefix 'extra' means outside, which tells us that extracellular digestion must occur outside the cell. During extracellular digestion, food is broken down outside the cell either mechanically or with acid by special molecules called enzymes.