Structure is the most general way to refer to an organ, body system, or region.
Entire refers to a complete organ, body system, or region.
Part refers to a part of an organ, body system, or region. Part does not refer to the entire organ, body system, or region.

Caption reference

CapRefId	sep-heart
CapRefType	Figure

below illustrates the relationships between the structure, entire, and part concepts applied to the heart.

Caption label

CapId	sep-heart
CapType	Figure

Structure-Entire-Part applied the heart

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