lo Figure 2. Synaptic transmission at a chemical synapse. 22. What is occurring
ID: 213375 • Letter: L
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lo Figure 2. Synaptic transmission at a chemical synapse. 22. What is occurring in Step 5 of Figure 2? Breakdown of the neurotransmitter by enzymes Stimulation of post-synaptic receptors by the neurotransmitter and activation of cellular responses in the post-synaptic cell Opening of voltage-gated calcium channels Reuptake of neurotransmitter into the presynaptic neuron Exocytosis/secretion of the neurotransmitter by calcium-dependent processes a. b. c. d. e. 23. What is occurring in Step 7 of Figure 2? a. Breakdown of the neurotransmitter by enzymes b. Stimulation of post-synaptic receptors by the neurotransmitter c. Reuptake of neurotransmitter into the presynaptic neuron d. Exocytosis/secretion of the neurotransmitter by calcium-dependent processes 24. Norepinephrine is used as the main neurotransmitter at which synapses? a. Neuromuscular junction b. Parasympathetic postganglionic target tissues c. Sympathetic postganglionic synapses d. a and b e. a, b and c 25. The major excitatory and inhibitory neurotransmitters in the central nervous system a. Glutamate and acetylcholine b. Glutamate and serotonin c. Norepinephrine and GABA d. Acetylcholine and GABA e. Glutamate and GABA 4Explanation / Answer
22. Option B is correct.
It is the process by which pre synaptic neuron activates the post synaptic neuron by the neurotransmittors.
23.
option c is correct.
It is the process in which the nuerotransmitters are taken back and formed into vesicles in presynaptic neuron.
24.
Option e is correct
Norepinephrine is used as nuerotransmitter in neuromuscular junctions, parasympathetic post ganglionic target tissues
as well as sympathetic postganglionic synapses.
25.
Option e is correct.
Major excitatory neurotransmitter in central nervous system is glutamte.
Major inhibitory neurotransmitter in central nervous system is GABA.
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