Neurons, Cocaine, and Shingles

June 10, 2012 at 8:11 pm #16592

Participant

1. While under the influence of cocaine, some users report prolonged feelings of pleasure because dopamine
a) reduces the refractory period of neurons
b) remains in the synapse longer than normal
c) increases the speed of nerve impulse transmission
d) diffuses rapidly throughout the pleasure centres of the brain

2. A hot foot results when a match is inserted in the side of a shoe and it lit. Very soon, the one recieving the hot foot
1. jerks their leg
2. feels the pain
3. grabs their foot
Which of the events requires a motor neuron?
a) 1 and 2
b) 2 and 3
c) 1 and 3
d) 1,2, and 3

3. Shingles is caused by Herpes Zoster infection of the dorsal root ganglia. This disease would affect
a) Motor impulses moving into the spinal cord
b) Motor impulses moving out of the spinal cord
c) Sensory impulses moving out of the spinal cord
d) Sensory impulses moving into the spinal cord

Help? I’m so lost. I thought I had the answers down, but now I’m having doubts 😥 The options are all very similiar.

June 11, 2012 at 3:09 am #111528

canalon

Participant

You might want to read the rules about homework. Explain what you think might be true (or false) and where are your doubts.
Or do you prefer to be told that d is correct for all 3 questions?

June 11, 2012 at 12:11 pm #111538

homeworkdisaster

Participant

Oh, I’m so sorry!
For the first once, I genuinely couldn’t decide between b, and d because both are true. What is your reasoning for going with d?
Could you explain why you think d is the right answer for 2?
I was leaning towards c since motor neurons are only responsible for execution through muscles and glands.
And for 3 – well, I was just totally lost on 3. I couldn’t even narrow it down. All of them seemed right at one point. Again, if you don’t mind explaining your reasoning for choosing d?

June 12, 2012 at 2:07 am #111547

canalon

Participant

Pure evil randomness, designed to make you challenge my points and show your work. So now let’s see if I can be of any help 👿

So I would definitely say b for 1 (see: http://en.wikipedia.org/wiki/Cocaine#Me … _of_Action) because that is the cause of the feeling. Even if it was diffusing slowly it would have the same effect, but simply not as fast.

for 2 you are probably right, and your reasoning appear sound.

for 3 I would say c or d, based on what I know and can quickly find on the disease, but I really do not know which would be correct.

June 29, 2012 at 9:23 pm #111728

david23

Participant

for 3 it’s d, sensory goes to the cord and motor away from, pretty logical.

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