What is the main organ of the circulatory system?, The heart., The brain, What is the function of the heart?, To pump blood throughout the body., To pump blood to the leg, What does blood transport?, Oxygen, nutrients, and waste products., Calories, protein, blood, blood, only oxigen, What are the blood vessels that carry blood away from the heart called?, arteries, artitris, What are the blood vessels that carry blood back to the heart called?, venas, veins, What are the smallest blood vessels in the body called?, Capilar, Capillaries., Where does the exchange of oxygen and nutrients take place?, in the blood., In the capillaries., What liquid circulates through the circulatory system?, bones, blood, brain, capillaries., How many chambers does the human heart have?, four, two, one, trhee, What color is commonly used to represent oxygen-rich blood in models?, red, blue, yellow, orange, What color is commonly used to represent oxygen-poor blood in models?, red, blue, orange, yellow, Which gas does the blood deliver to the body's cells?, blood., Oxygen., What happens to your heart rate when you exercise?, It increases., it decrease, What is the main function of the circulatory system?, To transport substances throughout the body., To transport protein throughout the body., What is the name of the heartbeat that can be felt in your wrist or neck?, Impulse, Pulse, transportation, nothing.

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