5 Written questions
5 Matching questions
- Do CNS nerve fibers generally regenerate?
- Which channels are activated for depolarization in an action potential?
- What is a presynaptic neuron? Postsynaptic neuron? Define converge, divergence of neurons.
- What are gated channel? There different gated channels, which channels are regulated by neurotransmitters?
- You may recall that a muscle fiber is an entire muscle cell; is a nerve fiber an entire neuron? (explain)
- a No because the neuron consists of many other things that make up the neuron (dendrites, axons, cell bodies, axon terminals)
- b Channels that are somehow opened to allow specific ions to enter and exit.
- c Voltage Gated Na+ Channels
- d Not really.
- e Presynaptic - The neuron that sends the action potential to the next dendrite
Postsynaptic - Receives the message
Convergence of Neurons - First one neuron is influenced by many others, resulting in a convergence of input.
Divergence of Neurons - When the neuron fires, the signal is sent to many other neurons, resulting in a divergence of output.
5 Multiple choice questions
- A bundle of neurons that travel to and from the same place.
- Cell bodies found in gray matter
Because the tissue is composed of fatty tissue.
- To travel across the synapse and get the action potential to the next neuron
Ach is acetylcholine
Cholinergic synapses -
- Schwann cells can point the neuron in the right direction so it can regrow to the proper receptor sites.
- 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
5 True/False questions
What is an EPSP and a IPSP? Are these graded potentials, action potentials, or can they be both? → Voltage Gated Na+ Channels
What advantage does having a myelin sheath give to a nerve fiber? → Mylination
Is the sodium-potassium pump and active or passive process? → In order to get back to polarization, they have to pump in 3 Na out, 2 K in
How is the sodium-potassium pump related to the resting potential of the nerve fiber? → Active
Describe the ionic basis for an action potential (depolarization). What is the ionic basis for repolarization? What is hyperpolarization? What ions are involved? → Voltage Gated Na+ Channels