5 Written questions
5 Matching questions
- You may recall that a muscle fiber is an entire muscle cell; is a nerve fiber an entire neuron? (explain)
- Axons are classified into 3 groups according to the relationship between diameter, myelination and propagation speed: define Type A, B and C fibers.
- Is the resting membrane of a nerve fiber more permeable to sodium ions or to potassium ion?
- Motor neurons are located where? Sensory neurons are located where?
- What is a graded potential? Can it travel a long distance? Why or why not?
- a 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)
- b 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
- c PNS
Everywhere except the brain
- d Sodium
- e No because the neuron consists of many other things that make up the neuron (dendrites, axons, cell bodies, axon terminals)
5 Multiple choice questions
- Central Nervous System (CNS) and Peripheral Nervous System (PNS)
Autonomic (involuntary). Within this, there are Sympathetic (Fight or Flight) and Parasympathetic (Rest and digest).
- To travel across the synapse and get the action potential to the next neuron
Ach is acetylcholine
Cholinergic synapses -
- 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.
- In the spinal cord
5 True/False questions
Do CNS nerve fibers generally regenerate? → A bundle of neurons that travel to and from the same place.
Describe the structure of a typical neuron. Identify as to structure and function: a cell body; dendrite; axon; microtubules; Nissl bodies; axon hillock. → Dendrites coming into cell body
cell body contains the nucleus goes into the axon starting with the axon hillock
the axon travels down to axon terminals
Exactly what is a nerve? → A bundle of neurons that travel to and from the same place.
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 axonal transport? What is the primary function of slow axonal transport vs fast axonal transport? → 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