B1 Nervous and Hormonal Coordination
Receptors, neurones, reflexes, the eye, hormones, blood glucose, water balance and plant responses.
How to study for CCEA GCSE Double Award Science
Build each scientific explanation from a model or relationship, show quantitative working, and connect every practical claim to controlled evidence and evaluation.
Core concepts
Concept 1
A nervous response follows stimulus, receptor, coordinator, motor pathway and effector in a defined sequence.
Exam cue: Identify the scientific model, relationship or practical evidence required by the command word.
Concept 2
Hormones travel in blood and usually act more slowly and for longer than electrical nervous signals.
Exam cue: Trace the full response pathway and name whether the effector is a muscle or gland.
Concept 3
Negative feedback detects departure from a set range and activates responses that oppose the change.
Exam cue: Use the current CCEA specification formatting and entered tier to decide whether Higher-only detail applies.
Risk pitfalls and guardrails
Reversing sensory and motor neurone directions or describing insulin as increasing blood glucose.
Guardrail: Do not import another board or science route, omit units from a calculation, or make a scientific claim beyond the stated evidence.
Giving a remembered fact without connecting it to the stated data, observation or scenario.
Guardrail: Do not import another board or science route, omit units from a calculation, or make a scientific claim beyond the stated evidence.
Importing content or paper structure from a separate-science or non-CCEA specification.
Guardrail: Do not import another board or science route, omit units from a calculation, or make a scientific claim beyond the stated evidence.
Memory anchors
Receptor
Cell or organ that detects a stimulus.
Sensory neurone
Carries impulses from a receptor to the central nervous system.
Motor neurone
Carries impulses from the central nervous system to an effector.
Reflex
Rapid automatic response that helps protect the body.
Hormone
Chemical messenger transported in blood to target cells.
Negative feedback
Control process that reverses a departure from the normal range.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
From a receptor to an effector, which order correctly traces a simple reflex pathway?
Why is a reflex useful?
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
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