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.
Intercellular Digestion: 1. Digestion occurs in the food vacuoles within cells. 2. Lysosomal enzymes are secreted into the food vacuole. 3. Products of digestion diffuse into cytoplasm through vacuolar membrane. 4. Ingestion occurs through pinocytic vesicle,e.g. protozoans, spongens and coeleneterates. 1. Digestion occurs outside of cells in the lumen of the alimentary canal. 2. Salivary, gastric pancreatic and intestinal enzymes are secreted into the digestive cavity. 3. Digested food materials are absorbed into blood through gut epithelia.