This video covers the following syllabus objectives from Edexcel IGCSE Biology 9-1 2.81 Understand that homeostasis is the maintenance of a constant internal environment, and that body water content and body temperature are both examples of homeostasis. 2.93 Describe the role of the skin in temperature regulation, with reference to sweating, vasoconstriction and vasodilation. For a PowerPoint on this topic visit www.mrexham.com