Kaname Hanada

1. Introduction Blood flow transports nutrients, hormones, metabolic waste products, O2, and CO2 throughout the body and plays various other roles, including controlling body temperature, pH, and osmotic pressure. Stagnation of blood flow in small blood vessels can be caused by numerous factors, including lack of exercise, a high-fat/high-calorie diet, smoking, fatigue, lack of sleep, and cold environments; diseases, such as diabetes, are also a cause.