Synapse

Rearrange the correct sequence of events of impulse transmission across the synapse​

​ 1. ​ (a)  

2. ​ ​ (b)  

3.​ ​ (c)  

4.​ ​ ​ (d)  

5. 5.​ ​ (e)  

• Opening of Voltage-Gated Calcium Channels
• Influx of Calcium Ions
• Synaptic vesicles fused with presynaptic membrane
• Acetylcholine is released into the synaptic cleft
• Neurotransmitter degradation occurs
• Action potential travels down the axon
• Receptor activation on the postsynaptic membrane
• Action potential arrives at presynaptic membrane

After acetylcholine binds to its receptor on the sarcolemma, what happens next?

• Ca²⁺ ions released into sarcoplasm

• Myosin binds to actin

• Na⁺ channels open, causing Na⁺ influx

• Synaptic vesicles fuse with presynaptic membrane

The enzyme responsible for breaking down acetylcholine after transmission is:

• ATPase

• Acetylcholinesterase

• Calcium ATPase

• Peptidase

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