This video covers the following syllabus objectives from Edexcel IGCSE Biology 9-1

2.80 Understand how organisms are able to respond to changes in their environment.

2.82 Understand that a co-ordinated response requires a stimulus, a receptor and an effector.

2.86 Describe how nervous and hormonal communication control responses and understand the differences between the two systems.

For a PowerPoint on this topic please visit www.mrexham.com

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