5 Written questions
5 Matching questions
- Is the resting membrane of a nerve fiber more permeable to sodium ions or to potassium ion?
- Describe the ionic basis for an action potential (depolarization). What is the ionic basis for repolarization? What is hyperpolarization? What ions are involved?
- Motor neurons are located where? Sensory neurons are located where?
- Define excitability. What kinds of cells possess excitability?
- Describe the structure of a typical neuron. Identify as to structure and function: a cell body; dendrite; axon; microtubules; Nissl bodies; axon hillock.
- a 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
- b PNS
Everywhere except the brain
- c Able to receive impulse from action potentials
- d Depolarization - Potential difference becomes smaller or less polar. If extracellular concentration of K+ increases, there is less gradient between inside and outside.
Hyperpolarization - Potential difference becomes greater or more polar. If extracellular concentration of K+ decreases, steeper gradient between inside and outside
- e Sodium
5 Multiple choice questions
- Takes one neuron to affect the other neuron and dictate a response.
Receptor, sensory neuron, control center, motor neuron, effectors
- Salutatory conduction of an action potential is when you jump from node to node.
- 3 Na out, 2 K in
5 True/False questions
What advantage does having a myelin sheath give to a nerve fiber? → Mylination
Which channels are activated for depolarization in an action potential? → In the spinal cord
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? → Central Nervous System (CNS) and Peripheral Nervous System (PNS)
Autonomic (involuntary). Within this, there are Sympathetic (Fight or Flight) and Parasympathetic (Rest and digest).
Axons are classified into 3 groups according to the relationship between diameter, myelination and propagation speed: define Type A, B and C fibers. → 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
Do CNS nerve fibers generally regenerate? → A bundle of neurons that travel to and from the same place.