9700 · 14.1
Homeostasis in mammals — FAQ
Frequently asked questions for 9700 Homeostasis in mammals. Direct answers first, then deeper explanation — then practise with marking.
What is the primary mechanism of homeostasis in mammals?
The primary mechanism of homeostasis in mammals is negative feedback. This system ensures that any change detected from a set point triggers a response that counteracts the initial change, bringing the internal condition back to normal. Understanding this is key for success in Cambridge 9700 Biology Paper 4, and our free revision lessons cover this in detail, along with practice questions and past papers.
How do mammals regulate body temperature?
Mammals regulate body temperature through thermoregulation, controlled by the hypothalamus. If the body gets too hot, mechanisms like vasodilation and sweating increase heat loss. If too cold, vasoconstriction, shivering, and increased metabolism generate and conserve heat. This complex control is a frequent topic in A Level Biology exams.
What role do hormones play in maintaining blood glucose levels?
Hormones like insulin and glucagon, produced by the pancreas, are vital for maintaining stable blood glucose levels. Insulin lowers high blood glucose by promoting uptake and storage, while glucagon raises low blood glucose by stimulating glucose release from the liver. These hormonal controls are a classic example of negative feedback.