1) Which of these statements is true? a) All arteries carry oxygenated blood b) All veins carry oxygenated blood c) Most arteries carry oxygenated blood d) Most veins carry oxygenated blood 2) Where do red blood cells collect oxygen from? a) Heart b) Lungs c) Small intestine d) Mouth 3) Which systems are connected to the circulatory system? a) Respiratory system  b) Digestive system c) Skeletal system d) Circulatory system e) The reproductive system f) The nervous system 4) What are the three main components of the circulatory system?  a) Blood vessels, heart and lungs b) Stomach, brain, heart c) Arteries, veins and capillaries d) Brain, blood vessels, heart 5) How many chambers does the heart have? a) two b) one c) four d) three 6) The chambers at the bottom of the heart are called a) right ventricle b) left ventricle c) right atrium d) left atrium

Circulatory System

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