10 apt for #1,2,7. 8 (2 pts) 4%pts Pt for each blank #3, 9 (2 pts) %pt for #4.6.

Question

10 apt for #1,2,7. 8 (2 pts) 4%pts Pt for each blank #3, 9 (2 pts) %pt for #4.6.10 (34 pt) %ot for 83, 5a, 5b, 5c (2 pts) t Complete #3, 5a, 5b,5c pts Name Section Date Label the following structures on Figure 12.11. Axon terminal of presynaptik - Symaptic vesicle J Postsynaptic neuron Votage-gated Ca?" channel Synaptic cleft 12 FOUR:1 2.1 ? structure of a neuronal synapse. 8 An action potential is generated at the a. trigger zone of the axon. b. postsynaptic membrane C. cell body d. axon terminal 9 What is the difference between an excitatory postsynaptic potential and an inhibitory postsynaptic potential? Introduction to the Nervous System UNIT 12 329

Explanation / Answer

Structure of neuronal synapse

Left side(from upper to lower)

1.synaptic vesicle

2.neurotransmitter

3.synaptic cleft

4.postsynaptic neuron

Right side(from upper to lower)

1.voltage gated Ca2+ channel

2.axon terminal of presynaptic neuron

3.neurotransmitter receptor

8.ans

a.trigger zone of axon

Normally action potential generated at trigger zone axon which generate impulse at very low threshold. This part is more excitable than any other part of soma or dendrites. It is located at axon initial segment.

9. Difference between an excitatory postsynaptic potential and inhibitory post synaptic potential

---Excitatory postsynaptic potential

1.provides small local depolarization

2.generally result from opening of Na+ channels

3.action potential of postsynaptic neuron becomes more likely

---Inhibitory postsynaptic potential

1.provides small local hyperpolarization.

2.generally result from opening of K+ or Cl- channels

3.action potential of postsynaptic neuron becomes less likely

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