activates and controls the digestive system, liver, intestines, pancreas,
stomach and the secretions they supply. It also activates the heart and
circulatory system. It circulates between the heart and navel centre including
small intestine and umbilical region. It stimulates and strokes the gastric
fire, activates and controls the digestive system. The main function of samana
is to maintain the balance between prana and apana.