physioex exercise 3 activity 8 Exam Questions and Answers Already Passed
The end of the axon where it contacts a target is called the - Answers axon terminal
Neurotransmitter is released into the synaptic gap by - Answers exocytosis
Exocytosis of neurotransmitter from the axon terminal is triggered by an increase in the intracellular
concentration of - Answers Ca2+
The neurotransmitter released into the synaptic gap reaches the target cell by - Answers diffusion
At the target, neurotransmitter - Answers binds to receptor proteins, causes membrane channels to
open or close, causes a change in membrane potential
You have just observed that each action potential in a burst can trigger additional neurotransmitter
release. If calcium ions are removed from the extracellular solution, what will happen to
neurotransmitter release at the axon terminal? - Answers there will be more neurotransmitter release
What will happen to neurotransmitter release when low amounts of calcium are added back to the
extracellular solution - Answers neurotransmitter release will increase a small amount
What will happen to neurotransmitter release when magnesium is added to the extracellular solution? -
Answers There will be no more neurotransmitter release
Why is there no neurotransmitter release from the axon terminal when there are no calcium ions in the
extracellular solution - Answers exocytosis of the synaptic vesicles is calcium-dependent
Why did the high intensity stimulation fail to trigger the same amount of neurotransmitter release in the
presence of extracellular Mg2+ as in the control extracellular solution? - Answers Mg2+ blocks the
calcium channels in the axon terminal
How is the neurotransmitter stored in the axon terminal before it is released? - Answers contained in
synaptic vessicles
Are neurotransmitter molecules released one at a time or in packets - Answers packets
With the normal extracellular calcium concentration, [Ca2+ ], when the action potential reaches the
axon terminal it
triggers - Answers release of neurotransmitter by exocytosis
Comparing the low intensity stimulus to the high intensity stimulus, the high intensity stimulus causes -
Answers more synaptic vesicles to undergo exocytosis
When the stimulus intensity is increased, what changes: the number of synaptic vesicles released or the
amount of neurotransmitter per vesicle? - Answers the number of synaptic vesicles being released
The end of the axon where it contacts a target is called the - Answers axon terminal
Neurotransmitter is released into the synaptic gap by - Answers exocytosis
Exocytosis of neurotransmitter from the axon terminal is triggered by an increase in the intracellular
concentration of - Answers Ca2+
The neurotransmitter released into the synaptic gap reaches the target cell by - Answers diffusion
At the target, neurotransmitter - Answers binds to receptor proteins, causes membrane channels to
open or close, causes a change in membrane potential
You have just observed that each action potential in a burst can trigger additional neurotransmitter
release. If calcium ions are removed from the extracellular solution, what will happen to
neurotransmitter release at the axon terminal? - Answers there will be more neurotransmitter release
What will happen to neurotransmitter release when low amounts of calcium are added back to the
extracellular solution - Answers neurotransmitter release will increase a small amount
What will happen to neurotransmitter release when magnesium is added to the extracellular solution? -
Answers There will be no more neurotransmitter release
Why is there no neurotransmitter release from the axon terminal when there are no calcium ions in the
extracellular solution - Answers exocytosis of the synaptic vesicles is calcium-dependent
Why did the high intensity stimulation fail to trigger the same amount of neurotransmitter release in the
presence of extracellular Mg2+ as in the control extracellular solution? - Answers Mg2+ blocks the
calcium channels in the axon terminal
How is the neurotransmitter stored in the axon terminal before it is released? - Answers contained in
synaptic vessicles
Are neurotransmitter molecules released one at a time or in packets - Answers packets
With the normal extracellular calcium concentration, [Ca2+ ], when the action potential reaches the
axon terminal it
triggers - Answers release of neurotransmitter by exocytosis
Comparing the low intensity stimulus to the high intensity stimulus, the high intensity stimulus causes -
Answers more synaptic vesicles to undergo exocytosis
When the stimulus intensity is increased, what changes: the number of synaptic vesicles released or the
amount of neurotransmitter per vesicle? - Answers the number of synaptic vesicles being released
