New York State Basic EMT-B Practice Exam: Prep & Practice Tests

Insulin plays a vital role in the body's ability to regulate glucose levels in the blood. When there is an increase in blood sugar, such as after eating, the pancreas releases insulin. This hormone facilitates the uptake of glucose by cells throughout the body, particularly in muscle and adipose (fat) tissues, allowing them to use glucose for energy. Without sufficient insulin, glucose remains in the bloodstream, leading to high blood sugar levels, which can cause serious health issues.

The function of insulin is critical for maintaining normal blood sugar levels and ensuring that cells have adequate energy. In contrast, other hormones like glucagon and cortisol primarily work in opposition to insulin, increasing blood sugar levels when they are low. Adrenaline is involved in the "fight or flight" response and also raises blood sugar levels to provide quick energy. However, only insulin specifically assists in transporting sugar from the blood to the cells for energy use.