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Differentiate between Heartwood/duramen and Sapwood / albernum?

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Heartwood (Duramen) Sap wood (Alburnum)
1. It is the central, dark coloured non-functional part of secondary xylem of an old stem. 1. It is the outer, light coloured functional part of secondary xylem of an old stem.
2. Parenchymatous cells of the heart-wood are dead. 2. Parenchymatous cells of sap wood are living.
3. The tracheary elements are plugged by tyloses or get filled with resins, gum or tannins. 3. The tracheary elements are not plugged.
4. Heart wood is heavier and more durable. 4. Sap wood is lighter and less durable.
5. Heart wood is less susceptible to the attack of pathogens and insects. 5. Sap wood is more susceptible to the attack of pathogen and insects.

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