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Circulatory System
 A Trip Through the Heart (Grades 5 and 6)

A Trip Through the Heart (Grades 5 and 6)
Reading Level
     edHelper's suggested reading level:   grades 5 to 6
     Flesch-Kincaid grade level:   5.33

Vocabulary
     challenging words:    ventricle, valve, muscle, works, power, pumps, tires, pump, heartbeat, during, upper, heart, actually, working, itself, flow

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A Trip Through the Heart
By Jennifer Kenny 		  
1     The heart is a muscle in the body that squeezes itself to send blood through the body's blood vessels. The heart works very hard but it never tires. It can also change how fast it pumps to meet the body's needs.
 
2     The heart is actually made of two pumps working side by side. Each pump has a small upper chamber called an atrium. Blood flows into the atrium from the vena cava, or main vein, or the pulmonary vein.
 
3     The ventricle is located below the atrium. It is a larger sized chamber. It is the heart's main pumping power. It squeezes hard during each heartbeat causing the blood inside it into the aorta, or main artery, or the pulmonary artery. Then the blood is sent around the body and to the lungs.

Paragraphs 4 to 5:
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