How does heartwood differ from sapwood?

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(C) Heartwood $(duramen)$ is the inner,older part of the secondary xylem that has become dark in color due to the deposition of organic compounds like

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Presence of dead and non-conductive elements

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(C) Heartwood $(duramen)$ is the inner,older part of the secondary xylem that has become dark in color due to the deposition of organic compounds like tannins,resins,oils,gums,aromatic substances,and essential oils. These substances make it hard,durable,and resistant to the attacks of microorganisms and insects. Due to the deposition of these materials,the elements of heartwood become dead and non-conductive,meaning they no longer participate in the conduction of water and minerals. In contrast,sapwood $(alburnum)$ is the peripheral,lighter-colored region of the secondary xylem that is involved in the conduction of water and minerals.

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