Target: 10 questions in 10 mins

1. The image shows an electron micrograph of a transverse section of a myelinated neuron.

Roadnottaken (edit)
CC BY-SA 3.0

1. Which row correctly describes structure X?

  Mostly composed of…  Function 
A. Lipids Energy storage
B. Proteins Propagation of action potential
C. Lipids Saltatory conduction 
D. Proteins Hyperpolarization 

Q2-4. The image below shows an action potential:

 Chris 73 (edited and updated)
CC BY-SA 3.0
2. Which letter corresponds to voltage gated sodium channels open in large numbers?
3. Which letter shows the concept of ‘all or nothing’?
4. Which letter is associated with reduced likelihood of a further action potential?

Q5&6. The image shows summation in a postsynaptic neuron. EPSP stands for excitatory postsynaptic potential. IPSP stands for inhibitory postsynaptic potential.

5. What can be concluded from the image?

I. EPSPs increases the likelihood of an action potential
II. Spatial summation has a greater effect than temporal summation
III. Only the stimulus at time X causes a change in membrane potential  
IV. The threshold potential is around -55mV
OpenStax (edited)
CC BY-SA 4.0
  • A. I only
  • B. II and III only
  • C. I and IV only
  • D. I, II, III and IV
6. Skin contact with capsaicin would most likely result in which of the following?
  • A. IPSPs
  • B. EPSPs
  • C. No change in membrane potential
  • D. Resting potential

7. The image shows a graph of conduction velocity of myelinated and unmyelinated neurons in cats (felines). The dotted lines are theoretical fits for the experimental data collected.

 

 WillowW
CC BY-SA 3.0

What can be concluded from the experimental data collected?

I. There is a linear relationship between axon diameter and conduction velocity in myelinated feline neurons
II. There is a positive correlation between axon diameter and conduction velocity
III. The same pattern should be present in all mammals
IV. Myelination of neurons in felines increases conduction velocity
  • A. I and IV only
  • B.  II and III only
  • C.  II and IV only
  • D. I, II, III and IV

Q8-10. The image below shows a synapse.  

 Dake (edited)
CC BY-SA 3.0

8. In dopaminergic synapses, where would dopamine accumulate due to the action of cocaine?
9. In acetylcholine synapses, where would neonicotinoid pesticides bind?
10. In acetylcholine synapses, where is the location of cholinesterase?