This lesson introduces insulin’s role in glucose regulation and explains how insulin products are classified by their timing of action. Knowing onset, peak, and duration helps match insulin to meals and anticipate hypoglycemia.
Insulin is released by the pancreatic beta cells in the islets of Langerhans, especially after a meal. As dietary carbohydrate is digested into glucose and glucose enters the bloodstream, insulin helps muscle, fat, and liver cells absorb glucose for energy. This action lowers blood glucose and supports glucose homeostasis.
All flashcards
What is insulin’s main role in glucose regulation?
Insulin helps muscle, fat, and liver cells absorb glucose from the bloodstream for energy, thereby lowering blood glucose and supporting glucose homeostasis.
What do onset, peak, and duration mean?
Onset is when insulin begins lowering glucose; peak is when its effect is strongest; duration is how long it continues to lower glucose.
Why is insulin peak time clinically important?
The glucose-lowering effect is strongest at peak, so the person is at increased risk of hypoglycemia around that time.
What are the typical timing characteristics of rapid-acting insulin?
It begins working in about 15–30 minutes, peaks in 1–2 hours, and lasts about 2–4 hours.
How does premixed insulin provide coverage?
It combines intermediate- and short-acting insulin in one injection to provide background coverage as well as mealtime coverage.
Quiz questions
Why is insulin generally administered by injection rather than taken orally?Answer: Digestive processes, including gastric acid, would affect insulin before absorption.
Why must an insulin pen not be shared, even if the needle is changed?Answer: Blood can flow back into the pen’s cartridge or reservoir and transmit pathogens.
In insulin pump therapy, what does the basal dose provide?Answer: Small, continuous background delivery of insulin.
Which insulin is typically administered intravenously in acute care?Answer: Human regular insulin.
What is a principal glucose-lowering action of GLP-1 receptor agonists?Answer: They increase insulin secretion when blood glucose is elevated.
Based on Pharmacology for Nurses by Tina Barbour-Taylor, Leah Mueller (Sabato), Donna Paris, Dorie Weaver (OpenStax), licensed CC BY 4.0. Adapted into a summary, flashcards and quizzes.