← Test 3, Chapter 11 Test
5 Written Questions
5 Matching Questions
- What is axonal transport? What is the primary function of slow axonal transport vs fast axonal transport?
- 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?
- 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?
- 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?
- How does nerve tissue respond to injury? What cells are responsible for the repair? Where can it occur?
- a IPSP, Inhibitory Post Synaptic Potential.
- b 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
- c 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
- d 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.
- e Through Neurotransmitters
Calcium has to go into the synapse to stimulate the vessels to open.
5 Multiple Choice Questions
- Schwann cells can point the neuron in the right direction so it can regrow to the proper receptor sites.
- A bundle of neurons that travel to and from the same place.
- 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.
- 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
5 True/False Questions
Describe two conditions that allow maintenance of the resting membrane potential. How are concentration gradients involved? → IPSP, Inhibitory Post Synaptic Potential.
What gives peripheral nerves their white appearance? → Only allows certain things through.
How are electrical potentials of cell membranes measured? → Only allows certain things through.
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? → 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
What is the most immediate effect of application of a threshold stimulus to a nerve fiber membrane? → Means that action potential doesn't have to travel down the entire axon, just jumps from node to node.