How responses are organised
How responses are organised
Organisms survive by detecting changes and making responses. A stimulus is a change in the internal or external environment, a receptor detects it, and an effector carries out the response.
Step-by-step lessons on Edexcel IGCSE Biology Co-ordination and response. Each one builds up to exam-style questions. Start with the foundational cell biology and core content before moving on to the more data-heavy ecology, genetics and practical-skills topics, which carry a large share of the exam marks.