Proteins can be structural, functional, or storage proteins. Structural proteins like collagen give support to tissues, functional proteins like enzymes speed up reactions, and storage proteins store nutrients. All proteins are made of amino acids, which include essential amino acids your body needs from food.

Key Points

• Structural: Collagen, keratin – support tissues.
• Functional: Enzymes – speed up chemical reactions.
• Storage: Ferritin – stores nutrients for later use.