Biology, 18.01.2021 19:20 flyingcerberus1408

Copy and complete these sentences using words from the list. You may use each word once, more than once or not at all blood , contracts , muscle , stretches , tubes , valves

The heart is made of . This muscle
and relaxes rhythmically, pumping blood around the
body. There are inside the heart that make sure the blood keeps flowing in the correct direction

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