PARKINSONS ANMD DOPAMINE

Perfect. I’m going to turn your entire dopamine + Parkinson’s lectures into HIGH-YIELD flashcards you can actually revise from for exams.

I’ll:

  • Start VERY basic → then build up

  • Group by topics (so your brain organises it)

  • Mix easy recall + exam-style + mechanism questions

🧠 CORE OVERVIEW (START HERE)

Q: What is Parkinson’s Disease?
A: A progressive neurodegenerative disorder caused by loss of dopaminergic neurons in the substantia nigra.

Q: What is dopamine (simple)?
A: A neurotransmitter involved in movement, reward, and behaviour.

🧠 SECTION 1: BRAIN STRUCTURES (FOUNDATION)

Basal Ganglia + Movement

Q: What is the basal ganglia?
A: A group of brain nuclei that control and coordinate movement.

Q: Main components of basal ganglia?
A:

  • Striatum

  • Globus pallidus

  • Substantia nigra

  • Subthalamic nucleus

Q: Role of motor cortex?
A: Initiates and controls movement.

Q: What does the basal ganglia mainly do?
A: Prevents unwanted movement and refines intended movement

Neurotransmitters in Movement

Q: What does glutamate do?
A: Excitatory (accelerator)

Q: What does GABA do?
A: Inhibitory (brakes)

Q: What is dopamine’s role in basal ganglia?
A: Modulates movement pathways

🧠 SECTION 2: PARKINSON’S DISEASE

Core Features

Q: 3 main motor symptoms of Parkinson’s?
A:

  • Tremor

  • Rigidity

  • Bradykinesia (slow movement)

Q: What is bradykinesia?
A: Slowness of movement

Q: What happens to gait in Parkinson’s?
A:

  • Shuffling

  • Hunched posture

  • Reduced fluidity

Pathophysiology

Q: Which neurons die in Parkinson’s?
A: Dopaminergic neurons in substantia nigra

Q: What are Lewy bodies?
A: Protein aggregates inside neurons (α-synuclein)

Q: Why are Lewy bodies harmful?
A: They produce ROS → neuronal death

Q: What is ROS?
A: Reactive oxygen species (neurotoxic molecules)

Early vs Late Symptoms

Q: Early non-motor symptoms?
A:

  • Constipation

  • Mood disorders

  • Sleep problems

Q: Late complications?
A:

  • Dementia

  • Psychosis

  • Postural instability

🧠 SECTION 3: DOPAMINE SYSTEM

Basic Function

Q: Main functions of dopamine?
A:

  • Movement

  • Reward

  • Decision making

  • Motivation

Dopamine Pathways

Q: Main reward pathway?
A:
VTA → nucleus accumbens → prefrontal cortex

Q: What is the VTA?
A: Ventral tegmental area (dopamine origin in reward)

Dopamine Synapse

Q: What releases dopamine?
A: Presynaptic neuron

Q: What removes dopamine?
A: Dopamine transporter (DAT)

Q: What packages dopamine?
A: VMAT (vesicular monoamine transporter)

Receptor Regulation

Q: What happens with too much dopamine stimulation?
A: Receptors internalise (downregulation)

Q: Why is this important?
A:

  • Reduces reward

  • Leads to tolerance

🧠 SECTION 4: ADDICTION + LEARNING

Conditioning

Q: Classical conditioning?
A: Association between neutral + meaningful stimulus

Q: Operant conditioning?
A: Behaviour shaped by reward/punishment

Reward

Q: What defines reward?
A: Behaviour leading to positive outcome

Q: What strengthens behaviour?
A: Dopamine release

Addiction

Q: Key features of addiction?
A:

  • Compulsive use

  • Loss of control

  • Continued use despite harm

Q: What causes tolerance?
A: Reduced receptor sensitivity

🧠 SECTION 5: DRUGS + DOPAMINE

Stimulants

Q: What do stimulants (e.g. methamphetamine) do?
A:

  • Increase dopamine release

  • Damage dopamine neurons

Q: Long-term effect of methamphetamine?
A:

  • Reduced DAT

  • Parkinson-like symptoms

Neurotoxicity

Q: How do stimulants cause damage?
A:
Microglia → ROS → neuron death

🧠 SECTION 6: TREATMENT

L-DOPA

Q: First-line treatment for Parkinson’s?
A: L-DOPA

Q: Why not give dopamine directly?
A: Cannot cross blood-brain barrier

Side Effects

Q: L-DOPA side effects?
A:

  • Nausea

  • Psychosis

  • Insomnia

  • Tremors

Other Drugs

Q: Dopamine agonists examples?
A:

  • Pramipexole

  • Ropinirole

Q: Risk of dopamine agonists?
A: Compulsive behaviours

Advanced Treatment

Q: What is deep brain stimulation?
A: Electrical stimulation of brain areas to improve movement

🧠 SECTION 7: CANNABINOIDS (EXAM GOLD)

Basics

Q: What are cannabinoids?
A: Compounds that act on CB receptors

Q: Main receptors?
A:

  • CB1 (brain)

  • CB2 (immune)

Mechanism

Q: How do cannabinoids work?
A:

  • Inhibit calcium channels

  • Open potassium channels

  • Reduce neurotransmitter release

Effects

Q: Positive effects?
A:

  • Pain relief

  • Reduced rigidity

  • Anti-anxiety

Q: Negative effects?
A:

  • Memory loss

  • hallucinations

  • paranoia

🧠 SECTION 8: NICOTINE (HIGH-YIELD)

Q: What receptor does nicotine act on?
A: nAChRs (nicotinic acetylcholine receptors)

Q: What type of receptor is nAChR?
A: Ligand-gated ion channel

Q: Effect of nicotine on dopamine?
A: Increases dopamine release

Q: Why is nicotine addictive?
A: Strong activation of reward pathway

🔥 HARD EXAM FLASHCARDS (IMPORTANT)

Q: Explain how dopamine loss leads to Parkinson’s symptoms
A:
Loss of dopamine → imbalance in basal ganglia → excessive inhibition of movement → bradykinesia

Q: Explain role of α-synuclein in Parkinson’s
A:
Misfolding → aggregation → Lewy bodies → ROS → neuronal death

Q: Explain how addiction develops (mechanism)
A:
Repeated dopamine release → receptor downregulation → tolerance → compulsive behaviour

Q: Link stimulants to Parkinson’s disease
A:
Stimulants damage dopaminergic neurons → reduce DAT → increase neurotoxicity → Parkinsonism

🚀 IF YOU WANT NEXT STEP

I can:

  • Turn this into Quizlet format (copy paste ready)

  • Make EXAM ESSAYS from these

  • Or test you with a full mock paper and mark you brutally

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