Biology / Bio 3093 · Atom · ~20 seconds
Compact versus Spongy Bone
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Compact bone forms a dense outer layer resisting bending stress, while spongy bone forms a lighter, porous inner lattice that reduces weight without sacrificing strength.
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A long bone's shaft is mostly compact bone, while its ends contain more spongy bone to absorb joint stress.
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Spongy bone is not weak bone — its lattice geometry distributes stress efficiently at lower mass.