Definition: A polypeptide hormone that regulates carbohydrate metabolism.

Alright class, settle down and let’s take a look! Now we have a tricky word today, "insulin," it’s quite the name, you see. The dictionary tells us it’s a “polypeptide hormone,” don't you agree? That sounds fancy, but let’s break it down for you with glee. “Polypeptide” simply means it’s made of many smaller building blocks - like tiny letters in a word! And "hormone" – well, that’s a messenger, sent from cell to cell, unheard. But the most important part, the key to understanding why insulin's so grand, is “regulates carbohydrate metabolism.” Let’s unpack this phrase with careful hand! Carbohydrate - think of sugars and starches, foods that give you energy – a tasty dance! Metabolism – that’s how your body uses all those fuels, a constant process, it truly rules. So, insulin's job is to help your cells take sugar from the food you eat, And use that energy for running, jumping, and dancing with glee! It keeps the levels nice and neat. Without insulin working just right, sugars can build up, a tricky plight, Leading to conditions like diabetes – let's keep it controlled, shining bright! Do you have any questions about this important hormone? Let’s discuss!