The circulatory system transports blood and helps in delivering oxygen, nutrients and chemicals to the cells of the body and in removing cell wastes.<unk> , meaning literally "blood movement", is the study of blood flow or the circulation and it includes studying the following concepts:
Cardiac output
Blood flow
Blood pressure
The factors influencing<unk>  are extensive and include circulating fluid volume, respiration, vascular diameter and resistance, and blood viscosity. Each of these may in turn be influenced by physiological factors, such as diet, exercise, disease, drugs or alcohol, obesity and excess weight.
Cardiac output
Blood flow
Blood pressure
Hemodynamics
Cardiac cycle
Muscle tone
Cerebral circulation
Gastrointestinal physiology
Renal function
Respiratory rate
Heart rate