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5 years ago
PhysioEx 9.0 Exercise 3 Activity 8 Review Sheet (1-5 Answers)
I had trouble with these so I found the answers worth sharing  Wink Face :

1.   The number of synaptic vesicles released increases when the stimulus intensity increases.

2.   There is no neurotransmitter release from the axon terminal when there are no calcium ions in the extracellular solution. Exocytosis of the synaptic vesicles is calcium dependent.

3.   Only a few were released with low Ca2+.

4.   The neurotransmitter release was less when magnesium was added.

5.   When magnesium is added to the extracellular fluid it blocks the calcium channels and inhibits the release of neurotransmitter.
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wrote...
Staff Member
5 years ago
What were the questions that lead to these answers? Now we're playing jeopardy aren't we lol
- Master of Science in Biology
- Bachelor of Science (Biology)
- Bachelor of Education
wrote...
5 years ago
They are from the PhysioEx 9.0 Exercise 3 Review sheet for Activity 7. There are only five questions in this section that I have answered above.

-cheers
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5 years ago
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julialunaa,  dannyww
Here is what I had...questions are included.

1. When the stimulus intensity is increased, what changes: the number of synaptic vesicles released or the amount of
neurotransmitter per vesicle?
Your answer:
The number of synaptic vesicles released increases as the stimulus intensity increases.
2. What happened to the amount of neurotransmitter release when you switched from the control extracellular fluid to the
extracellular fluid with no Ca2+ ? How well did the results compare with your prediction?
Your answer:
Because the exocytosis of the synaptic vesicles is Ca2+- dependent, when the extracellular fluid contained no Ca2+, no
neurotransmitter was released.
3. What happened to the amount of neurotransmitter release when you switched from the extracellular fluid with no Ca2+
to the extracellular fluid with low Ca2+ ? How well did the results compare with your prediction?
Your answer:
When Ca2+ ions were added to the extracellular fluid, a small amount of neurotransmitter was released.
4. How did neurotransmitter release in the Mg2+ extracellular fluid compare to that in the control extracellular fluid? How
well did the result compare with your prediction?
Your answer:
The neurotransmitter release was less when magnesium was added.
5. How does Mg2+ block the effect of extracellular calcium on neurotransmitter release?
Your answer:
Mg. will be oxidized to Mg2+. So instead of having Ca being the reducing agent, Mg will take its place. That is how blocking occurs.
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wrote...
Staff Member
5 years ago
Thank you Trin
- Master of Science in Biology
- Bachelor of Science (Biology)
- Bachelor of Education
wrote...
4 years ago
This helped so much thank you!
wrote...
4 years ago
What did you get through the Activity Lab itself, not for the Review section?  I'm having trouble with the lab itself and not the Review.
      
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