Exam skills
What the paper asks you to do
- Trace a reflex pathway
- Compare nervous and endocrine responses
- Explain negative feedback clearly
Human systems
Coordination and control
Compare nervous and hormonal coordination and explain receptors, reflexes and homeostatic control.5090 syllabus routeConcept · skill · exam language
What to know
Build the topic around four anchors.
- 01Receptors and effectors
- 02Neurones and reflex arcs
- 03Hormones
- 04Blood-glucose and temperature control
Common mistakes
Where marks disappear
- Confusing receptor with sense organ
- Treating hormones as electrical impulses
- Describing feedback without the corrective response
Structured practice
Answer these without looking back.
For each prompt, write the biological chain clearly enough that every mark-worthy link is visible.
- 01Trace a reflex from stimulus to response.
- 02Compare insulin and glucagon action.
- 03Explain one response to rising body temperature.
Continue learning
Read the connected explanation.
Follow ions and channels across an axon membrane, then see how an electrical signal becomes chemical at a synapse.
This independent teaching resource follows the Cambridge O Level Biology 5090 syllabus direction and is not endorsed by Cambridge International Education.