Blood flow is the continuous running of blood in the cardiovascular system. The human body is made up of several processes all carrying out various functions. We have the gastrointestinal system which aids the digestion and the absorption of food. We also have the respiratory system which is responsible for the absorption of and elimination of CO₂ .The urinary system removes waste from the body. The cardiovascular system helps to distribute food, and other product of metabolism. The reproductive system is also worth mentioning, this system is responsible for perpetuating the species. The nervous and endocrine system is responsible for coordinating the integration and function of other system.