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neurons & synapses

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4 detailed 50-minute lessons with teaching scripts, worked examples, parent guides, and assessment criteria.

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Lesson Overview

Total Lessons: 4
Tier: Foundation and Higher
Duration: 50 minutes per lesson (200 minutes total)
Exam Boards: AQA, Edexcel, OCR, Eduqas, CCEA

Learning Objectives

Prerequisites

Materials & Equipment

Lesson 1: Introduction: neurons & synapses

Duration: 50 minutes

Starter Activity (5 minutes)

Quick Recall

Write down everything you already know about neurons & synapses. Then check against the key terms: Psychology Exam Tips. Use a mini-whiteboard or paper.

Main Content (35 minutes)

Parent/Teacher Guide:
Before lesson: Read the script below. Pre-teach key vocab: Psychology Exam Tips.
If stuck: Re-read the revision notes (link above), then break the content into smaller steps.
Extension: See the Stretch & Challenge ideas in Lesson 4.
Teaching Script (35 mins):
Mins 0-5 - Hook: "Today: neurons & synapses. By the end you will be able to answer exam questions on it unaided. It connects to the rest of Psychology because the ideas here recur across the spec."
Mins 5-20 - Direct Instruction: Work through the core ideas below one at a time; after each, ask your student to explain it back in their own words.
Mins 20-30 - Guided Practice: Model the worked example together, then let your student attempt the first practice question with guidance.
Mins 30-35 - Independent Practice: 2-3 practice questions from Lesson 3 below, with immediate feedback.
First Look

Start with the revision notes summary, then attempt: Describe the structure and function of sensory, motor and relay neurons.

Plenary (5 minutes)

Check Out

Your student states one thing they learned and one question they still have about neurons & synapses.

Lesson 2: Core Concepts: neurons & synapses

Duration: 50 minutes

Starter Activity (5 minutes)

Review Previous Lesson

Quick recap: write 3 key points from Lesson 1 on neurons & synapses. Check them against the notes below.

Main Content (35 minutes)

Key Fact: Neurons are nerve cells that transmit electrical impulses. Three types: sensory neurons (carry signals from senses to CNS), relay neurons (connect sensory and motor neurons within the CNS), motor neurons (carry signals from CNS to muscles/glands).
Key Fact: Neuron structure: cell body (contains nucleus), dendrites (receive signals from other neurons), axon (long fibre carrying electrical impulses), myelin sheath (insulates axon, speeds up transmission), terminal buttons (release neurotransmitters at synapses).
Key Fact: Synaptic transmission: when an electrical impulse reaches the end of a neuron, it triggers release of neurotransmitters from vesicles in the terminal buttons. These cross the synaptic cleft and bind to receptors on the next neuron, triggering a new electrical impulse.
Key Fact: Neurotransmitters: excitatory neurotransmitters (e.g. glutamate, adrenaline) make the next neuron MORE likely to fire. Inhibitory neurotransmitters (e.g. GABA, serotonin) make the next neuron LESS likely to fire. The balance of excitatory and inhibitory signals determines whether a neuron fires.
Key Fact: Key neurotransmitters: serotonin (mood regulation - low levels linked to depression and aggression), dopamine (reward and motivation - involved in addiction and Parkinson's disease), acetylcholine (muscle contraction and memory - decline linked to Alzheimer's).
Psychology Exam Tips: When evaluating neurotransmitter research, consider: the relationship is correlational not causal (low serotonin correlates with depression but may not cause it), drug treatments provide indirect evidence, and the brain is more complex than simple chemical imbalance models suggest.

Practice (10 minutes)

Q: Describe the structure and function of sensory, motor and relay neurons.

Answer: Sensory neurons: carry information from sensory receptors to the CNS (long dendrites, short axons). Motor neurons: carry signals from the CNS to muscles and glands (short dendrites, long axons). Relay neurons: connect sensory and motor neurons within the CNS (short dendrites and axons). Together they form the reflex arc.

Plenary (5 minutes)

Explain Back

Your student teaches the key points back to you without looking. Fill any gaps immediately.

Lesson 3: Application: neurons & synapses

Duration: 50 minutes

Starter Activity (5 minutes)

Quick Recall

Recall the key terms: Psychology Exam Tips. Define each in one sentence.

Main Content (35 minutes)

Parent/Teacher Guide: Let your student attempt each question alone first, then compare with the model answer. Award method marks for correct working even if the final answer is wrong.

Q1: Describe the structure and function of sensory, motor and relay neurons.

Answer: Sensory neurons: carry information from sensory receptors to the CNS (long dendrites, short axons). Motor neurons: carry signals from the CNS to muscles and glands (short dendrites, long axons). Relay neurons: connect sensory and motor neurons within the CNS (short dendrites and axons). Together they form the reflex arc.

Q2: Explain how synaptic transmission works, including the role of neurotransmitters.

Answer: Electrical impulse travels down the axon -> reaches terminal buttons -> vesicles release neurotransmitters into the synaptic cleft -> neurotransmitters diffuse across and bind to receptors on the postsynaptic neuron -> if excitatory signals exceed inhibitory signals, the next neuron fires. The signal is unidirectional (only released from the presynaptic neuron).

Q3: Discuss the role of neurotransmitters in behaviour, referring to serotonin and dopamine.

Answer: Serotonin regulates mood, sleep and appetite. Low serotonin is linked to depression (SSRIs increase serotonin and treat depression) and aggression. Dopamine is involved in reward, motivation and movement. Excess dopamine is linked to schizophrenia; low dopamine in motor areas causes Parkinson's disease. Both show that chemical imbalances affect behaviour.

Plenary (5 minutes)

Error Review

Review any questions answered incorrectly. Identify whether the error was knowledge, method, or reading the question.

Lesson 4: Exam Practice: neurons & synapses

Duration: 50 minutes

Starter Activity (5 minutes)

Command Words

Review what these command words require: state (one point), describe (say what happens), explain (say why), compare (both sides), evaluate (judgement).

Main Content (35 minutes)

Extended Answer

Extended question: Full-Mark Response Evaluate the contribution of neuroscience to our understanding of behaviour, discussing the limitations of neurotransmitter explanations. <div class="

A grade 9 response will: describe neurotransmitter functions (serotonin, dopamine, acetylcholine); present supporting evidence (drug treatments, brain scanning studies); evaluate limitations (correlational not causal, reductionist, ignores social/cognitive factors, individual differences in neurotransmitter activity); consider the diathesis-stress model (biological vulnerability + environmental triggers); conclude: neurotransmitter research has made important contributions (especially to understanding mental health and developing drug treatments), but reductionist explanations that ignore psychological and social factors are incomplete. A biopsychosocial approach provides a more comprehensive understanding.

Exam Tips: Sensory = sense to CNS. Motor = CNS to muscle. Relay = connects them in CNS. | Synaptic transmission: electrical -> chemical (neurotransmitter) -> electrical. It is ONE-WAY. | Excitatory = more likely to fire. Inhibitory = less likely to fire. Behaviour depends on the BALANCE.
Common Errors: Watch Out! Students often make mistakes here. Wrong: Neurotransmitters directly cause specific behaviours - low serotonin causes depression. Correct: While low serotonin is consistently associated with depression, this does not prove it causes depression. The relationship could be bidirectional (depression might reduce serotonin), or both could be caused by a third factor (e.g. chronic stress). SSRIs increase serotonin immediately but take weeks to improve mood, suggesting the relationship is more complex than simple cause and effect. The diathesis-stress model suggests biological vulnerability interacts with environmental triggers.
Stretch & Challenge (Grade 8-9):
  • Synoptic links: explain how neurons & synapses connects to another Psychology topic you have studied
  • Real-world: research one real-world use or example of neurons & synapses
  • Critical: "What are the limitations of the models used in neurons & synapses?"

Plenary (5 minutes)

Assessment Criteria
  • Got it: Confident explanation + correct worked examples
  • Getting there: Main points OK, needs support with detail
  • Not yet: Confused on key concepts - re-run Lesson 2

Homework & Consolidation

Recommended Resources

🎓 Smart Lesson (Guided)