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).
Four layers of tissue form the walls of the digestive tract. These  layers are called mucosa, submucosa, muscularis externa and  adventitia. Simple Squamous Epithelial Tissue which are used for the diffusion of gasses between the capillaries and the alveoli. The layer of heart wall composed of cardiac muscle tissue is called the myocardium.