The symptoms of flu usually develop within one to three days of becoming infected. Most people will feel better within a week. However, you may have a lingering cough and still feel very tired for a further couple of weeks. Flu can give you any of the following symptoms: a sudden fever â a temperature of 38C (100.4F) or above.
The lymphatic system has three functions: 1  The removal of excess fluids from body tissues. 2  This process is crucial because water, proteins, and other substances are continuously leaking out of tiny blood capillaries into the surrounding body tissues. Absorption of fatty acids and subsequent transport of fat, chyle, to the circulatory system. 2  Production of immune cells (such as lymphocytes, monocytes, and antibody producing cells called plasma cells).
Organs and parts of the lymphatic system Lymphatic tissue. This is a type of connective reticular tissue that contains immunity cells. Tonsils. While seemingly an inconsequential organ, the tonsils actually play a vital part in the organization of the human immune system. This organ is an aggregation of several lymph nodes under the mucus membrane of the mouth (oral cavity).