1. Name_________________________________________Class________ Date____________
THE CIRCULATORY SYSTEM
1.- What is the job of the circulatory system?
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2.- What are the three main parts of the circulatory system?
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3.- What are the three layers of tissue that made up the heart´s walls?
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4.- What is the lub-dub sound we hear when listening to the heart?
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5.- What are the 3 types of major vessels? What are the differences between each?
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6.- What two things help the blood in veins return to the heart?
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7.- How much blood is contained in an average adult?
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8.- What are the four components of the blood?
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9.- What does the hemoglobin in red blood cells do help the circulatory system?
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10.- What is the function of white blood cells?
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