Powerpoint lecture and associated PDF worksheet covering the following in a modern, concise format:
Specification Point 2.80 - Understand how organisms are able to respond to changes in their environment.
Specification Point 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.
Specification Point 2.82 - Understand that a coordinated response requires a stimulus, a receptor and an effector.
Complete set of Chapter 4 Lessons are available.
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