RT Book, Section A1 Kibble, Jonathan D. A1 Halsey, Colby R. SR Print(0) ID 1106601944 T1 Blood T2 Medical Physiology: The Big Picture YR 2015 FD 2015 PB McGraw-Hill Education PP New York, NY SN 978-0-07-148567-8 LK accessphysiotherapy.mhmedical.com/content.aspx?aid=1106601944 RD 2024/04/18 AB Blood circulates within the cardiovascular system to provide a vehicle for the distribution of respiratory gases, nutrients, water, electrolytes, hormones, antibodies, drugs, metabolic waste, and heat throughout the body. Most of the major negative feedback control systems of the body defend normal blood composition (e.g., blood glucose concentration, blood volume, and arterial O2 partial pressure). Blood is composed of cellular elements (i.e., red blood cells, white blood cells, and platelets), which are suspended in blood plasma. A person who weighs 70 kg has approximately 5 L of blood, of which about 2 L is occupied by the formed cellular elements and 3 L is plasma.