* Enzymes are a specific type of protein that catalyze (speed up) chemical reactions. They are biological catalysts.
* Proteins have many other functions in the body besides catalyzing reactions. These functions include:
* Structural support: Collagen and keratin provide structural support for tissues and organs.
* Transport: Hemoglobin carries oxygen in the blood, and albumin transports fatty acids.
* Hormonal: Insulin and growth hormone regulate various bodily functions.
* Immune defense: Antibodies protect against pathogens.
* Storage: Casein in milk stores protein for developing infants.
In essence, enzymes are a subset of proteins with a specific function. Many proteins have functions unrelated to catalysis.
