BIOL 223 Chapter 12-2
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List the four structural classes of neurons discussed in class.
An neuron whose axons and dendrites are indistinguishable is an:
Where in the human body do we find anaxonic neurons?
- the brain
- special sense organs
An axon with two processes, one on each end, is called a:
Which structural type of neuron is the most rare?
A neuron with one process leaving the cell body that splits into dendrites and synapses is a(n):
All sensory neurons are _______ neurons.
A neuron with an axon on one end and multiple dendrites on the other end is a:
Which type of neuron is the most common?
Motor neurons are _______ neurons.
Somatic sensory neurons carry information from sensory receptors to the:
central nervous system
True or False: We are aware of the information being transmitted by somatic sensory neurons.
List the three functional classes of neurons discussed in class.
- sensory neurons
- motor neurons
Visceral sensory neurons carry information about your _______ to the CNS.
Are we aware of the information being transmitted by visceral sensory neurons?
no, we are not
List the three types of sensory receptors discussed in class.
Organ systems and sense of taste are monitored by:
Muscle position and tension of ligaments and tendons are monitored by:
Which type of receptor monitors the external environment, tactile receptors, and the remaining special senses?
What is the purpose of interneurons?
to integrate somatic and motor neural systems
Which functional type of neurons are involved in higher function and outnumber the other types of neurons?
What type of cell myelinates neurons?
Which type of propagation involves unmyelinated axons?
List the four steps of continuous propagation discussed in class.
- axon hillock depolarizes (+30 mV) and action potential reaches 1st subunit opening sodium channels
- sodium diffuses towards the 2nd subunit and brings it to threshold
- voltage-gated channels open, sodium flows in, segment 2 depolarizes to +30 mV
- process then repeats
List the four steps of saltatory propagation discussed in class.
- intial segment depolarizes to +30 mV
- sodium ions diffuse to node 1 and bring it to threshold
- voltage-gated channels open and node 1 depolarizes
- process continues
Which type of propagation is faster, continous or saltatory?
Which type of neurons are myelinated and have the largest diameter?
type A neurons
Which type of neurons are myelinated with an intermediate diameter?
type B neurons
Which type of neuron in unmyelinated with the smallest diameter?
type C neurons
Which neuron will communicate faster, a large myelinated neuron, or a small unmyelinated neuron?
large, myelinated neuron
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