Study Notes
Homeostasis is the maintenance of a constant internal environment, ensuring that conditions like temperature and glucose levels remain within set limits for proper body function.
- Homeostasis — the maintenance of a constant internal environment Example: Keeping body temperature around 37°C.
- Negative Feedback — a process that returns conditions to a set point when they deviate Example: Insulin and glucagon regulating blood glucose levels.
- Insulin — a hormone that decreases blood glucose levels by converting glucose into glycogen Example: Produced by the pancreas when blood glucose is high.
- Glucagon — a hormone that increases blood glucose levels by breaking down glycogen Example: Produced by the pancreas when blood glucose is low.
- Type 1 Diabetes — a condition where the pancreas cannot produce insulin Example: Treated by insulin injections to manage blood glucose levels.
- Vasodilation and Vasoconstriction — processes that regulate heat loss through blood vessels Example: Vasodilation increases heat loss when hot, vasoconstriction reduces heat loss when cold.
Exam Tips
Key Definitions to Remember
- Homeostasis
- Negative Feedback
- Insulin
- Glucagon
- Type 1 Diabetes
Common Confusions
- Confusing glucagon with glycogen
- Misunderstanding the role of insulin in glucose regulation
Typical Exam Questions
- What is homeostasis? The maintenance of a constant internal environment.
- How does negative feedback work? It returns conditions to a set point when they deviate.
- How is Type 1 diabetes treated? By injecting insulin to manage blood glucose levels.
What Examiners Usually Test
- Understanding of negative feedback mechanisms
- The role of insulin and glucagon in blood glucose regulation
- The physiological responses to temperature changes