10) Circulatory System Gizmo Already Passed

How many chambers does the heart have? {Ans: 4}In what order does the blood flow through the chambers? {Ans: Right atrium, right ventricle, left atrium left ventricle}Where does urea enter the blood? {Ans: liver}What are white blood cells? {Ans: large cells that fight disease}What do pulmonary arteries do? {Ans: carry blood from the right ventricle to the lungs}What do heart valves do? {Ans: control the flow of blood through the heart}What do pulmonary veins do? {Ans: carry blood from the lungs to the left atrium}What are red blood cells? {Ans: small round cells that carry oxygen}Where is sugar removed from the blood? {Ans: capillaries}Where does sugar enter the blood? {Ans: intestines}What causes heart beats? {Ans: Heart valves opening and closing}What type of blood vessel usually carries oxygen-rich blood? {Ans: arteries}What type of blood vessel usually carries oxygen-poor blood? {Ans: veins}In which type of blood vessel is oxygen released into blood cells? {Ans: capilaries}What are platelets? {Ans: tiny fragments that stop bleeding when you have a cut}Where is urea removed from the blood? {Ans: kidneys}