Drugs and synaptic transmission

Drugs and synaptic transmission Quiz

Spec 8.7 · Edexcel International A Level Biology: Quiz

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5 questions, one answer each

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  1. 1. Which drug blocks voltage-gated sodium ion channels in sensory neurones?

    • A. Nicotine
    • B. Lidocaine
    • C. L-DOPA
    • D. MDMA

  2. 2. Why does cobra venom alpha toxin cause paralysis?

    • A. It stimulates continuous contraction
    • B. It destroys acetylcholine in the cleft
    • C. It prevents calcium ions entering the knob
    • D. It blocks acetylcholine receptors on the muscle membrane

  3. 3. Why is L-DOPA used to treat Parkinson's disease instead of dopamine?

    • A. L-DOPA is cheaper to make
    • B. L-DOPA can cross the blood-brain barrier
    • C. Dopamine is broken down by acetylcholinesterase
    • D. L-DOPA blocks dopamine receptors

  4. 4. What effect does MDMA have on serotonin in the synaptic cleft?

    • A. It blocks serotonin receptors
    • B. It breaks serotonin down
    • C. It increases serotonin by causing release and inhibiting reuptake
    • D. It prevents calcium ions entering the knob

  5. 5. Which statement about nicotine is correct?

    • A. It opens sodium ion channels by acting like acetylcholine
    • B. It blocks acetylcholine receptors
    • C. It stimulates the breakdown of acetylcholine
    • D. It blocks voltage-gated sodium ion channels

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