Final answer:
Insulin injections help regulate blood glucose levels, and combination pens do not need refrigeration after first use.
Step-by-step explanation:
Insulin injections play a crucial role in regulating blood glucose levels in individuals with diabetes. They allow for the transport and storage of glucose, helping to either decrease or increase blood glucose levels as needed in response to different scenarios. Combination pens refer to insulin pens that contain both basal (long-acting) and bolus (short-acting) insulin in the same device. These pens do not require refrigeration after the first use because the insulin remains stable at room temperature. Storing insulin in the freezer is not recommended as extreme cold temperatures can affect the efficacy of the medication.