OCR A Level Biology A
OCR A Level Biology A Neuronal Communication Exam Questions
Free OCR A Level Biology A exam questions on Neuronal Communication, with mark schemes. Covers sensory receptors, neurone structure, action potentials and synapses.
Neuronal Communication exam questions
1 question pack of real past exam questions with its mark scheme. Answer every question without notes, then mark your answers line by line against the mark scheme.
StemUp mark scheme flashcards
OCR A Level Biology A H420 Flashcards (Anki & Quizlet)
Every answer is written in mark scheme wording, so you learn exactly what examiners give marks for. Use them on Anki or Quizlet, then test yourself with the questions on this page.
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About OCR A Level Biology A Neuronal Communication
This topic covers how nerve impulses work.
What you need to know
- Receptors Transducers such as the Pacinian corpuscle.
- Action potentials Resting potential, depolarisation, repolarisation and the refractory period.
- Saltatory conduction Myelin speeds transmission.
- Synapses Cholinergic synapses, summation and inhibition.
Common mistakes in Neuronal Communication
- Saying impulses jump between neurones.
- Forgetting sodium channels are voltage-gated.
- Mixing spatial and temporal summation.
Try three Neuronal Communication exam-style questions
1. State the resting potential of a neurone. (1 mark)
Show the mark scheme answer
About −70 mV.
2. Explain why impulses are faster in myelinated neurones. (2 marks)
Show the mark scheme answer
Depolarisation only occurs at nodes of Ranvier (1), so the impulse jumps between nodes (1).
3. Describe the role of acetylcholinesterase. (1 mark)
Show the mark scheme answer
Breaks down acetylcholine so the synapse is not continuously stimulated.
Neuronal Communication FAQs
What does Neuronal Communication cover?
Receptors, action potentials and synapses.
What is the refractory period?
A time after an action potential when another cannot be produced.
Why are synapses one-way?
Only the presynaptic neurone releases neurotransmitter.
Revise this topic with flashcards: OCR A Level Biology A H420 Flashcards, with mark scheme answers for Anki and Quizlet.
