Which description of the heart is correct?
1 )
The heart is an organ, containing several systems, which forms part of the circulatory tissue.
The heart is an organ, containing several tissues, which forms part of the circulatory system.
3 )
The heart is a system, containing several organs, which forms part of the circulatory tissue.
4 )
The heart is a system, containing several tissues, which forms part of the circulatory organ.
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