5 Written questions
5 Matching questions
- What is salutatory conduction of an action potential? Does it occur in all nerve fibers? How does diameter of a nerve fiber affect speed of conduction?
- What is the role of the Schwann Cell in the formation of the myelin sheath. What is the neurilemma? What is a node of Ranvier? Are nodes of Ranvier in both the CNS and the PNS?
- Do CNS nerve fibers generally regenerate?
- What is the role of a neurotransmitter? What is Ach? What are cholinergic synapses? What kind of transmitters are dopamine and serotonin?
- What ions are pumped out the cell when the Na/K pump is activated?
- a 3 Na out, 2 K in
- b To travel across the synapse and get the action potential to the next neuron
Ach is acetylcholine
Cholinergic synapses -
- c Salutatory conduction of an action potential is when you jump from node to node.
- d Schwann Cell wraps around the axon to form the myelin sheath.
Neurilemma is the plasma membrane of a neuron
Ranvier is the space between mylination
- e Not really.
5 Multiple choice questions
- In CNS, it doesn't heal.
In PNS, if mylineation cells are still in tact, they will reform a path for the neuron to grow.
Schwann Cells or Oligodendricites
- Axonal transport is a cellular process responsible for movement of mitochondria, lipids, synaptic vesicles, proteins, and other cell parts (i.e. organelles) to and from a neuron's cell body, through the cytoplasm of its axon
- Certain stimulus happens repeatedly, and adds to threshold in order to get an action potential.
Results in threshold
5 True/False questions
Is the sodium-potassium pump and active or passive process? → Active
What is an EPSP and a IPSP? Are these graded potentials, action potentials, or can they be both? → EPSP - Excitatory Post Synaptic Potential; potential of the cell to reach threshold again after it has been through a cycle.
IPSP - Inhibitory Post Synaptic Potential; Hyperpolarize on purpose to prevent a response to every stimulus.
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.
Which channels are activated for depolarization in an action potential? → Voltage Gated Na+ Channels
What are gated channel? There different gated channels, which channels are regulated by neurotransmitters? → Channels that are somehow opened to allow specific ions to enter and exit.