5 Written questions
5 Matching questions
- Do CNS nerve fibers generally regenerate?
- What is a graded potential? Can it travel a long distance? Why or why not?
- Is the sodium-potassium pump and active or passive process?
- How is the sodium-potassium pump related to the resting potential of the nerve fiber?
- Describe the importance of the Schwann cells in regeneration of the nerve fiber following injury.
- a Active
- b Not really.
- c Schwann cells can point the neuron in the right direction so it can regrow to the proper receptor sites.
- d In order to get back to polarization, they have to pump in 3 Na out, 2 K in
- e A change in the membrane potential that is localized to one area of the plasma membrane. Also known as local potentials.
Cannot travel long distances because they spread in a decremental fashion. They rapidly decrease in magnitude as they spread over the surface of the plasma membrane (teacher's voice in a large lecture hall)
5 Multiple choice questions
- Only allows certain things through.
- No because the neuron consists of many other things that make up the neuron (dendrites, axons, cell bodies, axon terminals)
- Through Neurotransmitters
Calcium has to go into the synapse to stimulate the vessels to open.
- Channels that are somehow opened to allow specific ions to enter and exit.
5 True/False questions
What advantage does having a myelin sheath give to a nerve fiber? → Means that action potential doesn't have to travel down the entire axon, just jumps from node to node.
What is summation? Temporal and spatial summation result in what? → Only allows certain things through.
Motor neurons are located where? Sensory neurons are located where? → PNS
Everywhere except the brain
What gives peripheral nerves their white appearance? → Mylination
How are electrical potentials of cell membranes measured? → spatial variation of both electrical potential and chemical concentration across a membrane.