Synapses Quiz
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5 questions, one answer each
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1. Which ion enters the presynaptic knob when an action potential arrives?
- A. Sodium ions
- B. Potassium ions
- C. Calcium ions
- D. Chloride ions
2. Which structure ensures that transmission at a cholinergic synapse is in one direction only?
- A. Acetylcholine receptors only on the postsynaptic membrane
- B. Acetylcholinesterase only inside the presynaptic knob
- C. Mitochondria only in the postsynaptic neurone
- D. Calcium ion channels only on the postsynaptic membrane
3. What is the role of acetylcholinesterase?
- A. To open sodium ion channels
- B. To make acetylcholine from choline
- C. To move vesicles to the membrane
- D. To hydrolyse acetylcholine in the cleft
4. A drug stops calcium ions entering the presynaptic knob. What is the immediate effect?
- A. Acetylcholine is not released
- B. Acetylcholine is not hydrolysed
- C. Sodium ion channels stay open
- D. Receptors cannot bind acetylcholine
5. A muscle shows continuous contraction after exposure to a chemical. Which action of the chemical best explains this?
- A. It blocks acetylcholine receptors
- B. It prevents vesicle fusion
- C. It inhibits acetylcholinesterase
- D. It stops mitochondria making ATP