This section is split into six topics, which you can work through sequentially.

The aim of this section is to help you understand about how insulin produced in the pancreas acts, why insulin action is decreased in diabetes and what this does, and how this insulin can be replaced with manufactured insulin.

- T1: How does insulin control key pathways?
- T2: How does insulin change in type 1 diabetes?
- T3: How does insulin action change in type 2 diabetes?
- T4: Why is insulin given to people with diabetes?
- T5: Summary
- T6: Test yourself

By the end of the section, you should be able to:

• Understand the different processes that insulin controls in the healthy body
• Describe the key changes that happen in insulin secretion and action of insulin in diabetes
• Outline why manufactured insulin is used in diabetes