Glycosaminoglycan

This family of carbohydrates is essential or important for life.
GAGs form an important component of connective tissues. GAG chains may be covalently linked to a protein to form proteoglycans. Water sticks to GAGs; this is where the resistance to pressure comes from. The density of sugar molecules and the net negative charges attract cations, for example, Na+, which, after the sodium binds, attracts water molecules.
Some examples of glycosaminoglycan uses in nature include heparin as an anticoagulant, hyaluronan as a component in the synovial fluid lubricant in body joints, and chondroitins, which can be found in connective tissues, cartilage, and tendons.
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