CASAS Forms 187R/188R Level D Practice Test 2026 - Free CASAS Level D Practice Questions and Study Guide

Insulin is the hormone that helps glucose move from the blood into the body’s cells to be used for energy. When the pancreas doesn’t produce enough insulin, glucose stays in the bloodstream rather than entering cells, which is what diabetes describes. This distinguishes the term from options like hazard (a risk or danger), automatic (self-operating), and an employee handbook (a workplace document). So the condition characterized by insufficient insulin production is diabetes.