5 Written Questions
5 Matching Questions
- What are gated channel? There different gated channels, which channels are regulated by neurotransmitters?
- What is an EPSP and a IPSP? Are these graded potentials, action potentials, or can they be both?
- Are nerve fiber in the CNS mylelinated? Do they have a neurilemma?
- Define excitability. What kinds of cells possess excitability?
- If a neuron synapses on a second neuron and drives the resting membrane potential further from threshold, what is this called? Where does it occur?
- a IPSP, Inhibitory Post Synaptic Potential.
- b Yes
- c Channels that are somehow opened to allow specific ions to enter and exit.
- d 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.
- e Able to receive impulse from action potentials
5 Multiple Choice Questions
- Type A - large-diameter, myelinated. Conduct at 15-120 m/s. Motor neurons supplying skeletal and most sensory neurons
Type B - medium-diameter, lightly myelinated. Conduct at 3-15 m/s. Part of ANS
Type C - small-diameter, unmyelinated. Conduct at 2 m/s or less. Part of ANS
- Certain stimulus happens repeatedly, and adds to threshold in order to get an action potential.
Results in threshold
Everywhere except the brain
- Cell bodies found in gray matter
Because the tissue is composed of fatty tissue.
5 True/False Questions
Do CNS nerve fibers generally regenerate? → Not really.
Is the resting membrane of a nerve fiber more permeable to sodium ions or to potassium ion? → Active
How are nerve impulses transmitted across synapses? Compare this to transmission of an impulse from nerve fiber to muscle fiber. Is transmission of the impulse across a synapse one-way? What role does calcium play in the release of a neurotransmitter? → Through Neurotransmitters
Calcium has to go into the synapse to stimulate the vessels to open.
What gives peripheral nerves their white appearance? → Only allows certain things through.
What is neuroglia? How do these cells compare (in structure, number, and function) to the neurons. What are the functions of each of the neuroglia? Which ones are in the CNS and which ones are in the PNS? → Neuroglia are cells that support and protect neurons
There are more neuroglia than neurons, they don't have dendrites or axons.
Astrocytes (CNS) - Forms blood brain barrier, protects neurons, allow the exchange of nutrients and waste
Oligodendricites - Mylinate the CNS
Epidymal (CNS) - Circulate the cerebral spinal fluid
Microglia - Eat debris in the CNS
Satellite and Schwann Cells are in the PNS.