B5 - Enzymes and Digestive Systems

Enzymes are essentially nature's speed boosters - they're biological catalysts that accelerate chemical reactions without being used up themselves. Think of them as the ultimate multitaskers in your body.

Your digestive system relies on three main digestive enzymes to break down food into molecules small enough to enter your bloodstream. Amylase (produced in salivary glands, pancreas, and small intestine) converts starch into simple sugars - that's why bread tastes sweeter when you chew it longer. Proteases are made in your stomach, pancreas, and small intestine to break proteins down into amino acids. Meanwhile, lipases from your pancreas and small intestine tackle fats, converting lipids into fatty acids and glycerol.

Temperature dramatically affects enzyme performance, and your body maintains 37°C because that's when your enzymes work best - this is called the optimum temperature. Go higher, and the enzyme's active site changes shape permanently through denaturation, essentially breaking your molecular machinery.

pH levels are equally critical since changing acidity also alters the enzyme's active site shape. Move too far above or below the optimum pH, and enzyme activity plummets - which explains why your stomach's extreme acidity suits proteases perfectly whilst other enzymes would fail miserably there.

Remember: Enzymes are incredibly specific - like keys that only fit particular locks. Change their shape through extreme temperature or pH, and they become useless!