Blood Sugar Level - GCSE Biology Definition

Blood sugar level, also known as blood glucose level, refers to the concentration of glucose in the bloodstream. It is a key part of homeostasis because glucose provides energy for cells, especially in the brain and muscles. In GCSE Biology, students learn that the body controls blood sugar levels using the hormones insulin and glucagon, which are produced by the pancreas. Insulin lowers blood glucose by helping cells take in glucose from the blood, while glucagon raises it by causing the liver to release stored glucose. Keeping blood sugar levels stable is important for health and helps prevent conditions such as diabetes.