Name Section Date UN 12 Check Your Understanding Critical Thinking and Applicati
ID: 3512250 • Letter: N
Question
Name Section Date UN 12 Check Your Understanding Critical Thinking and Application Questions REVIEW 1 You are examining a neuronal process and you find that it generates action potentials. Is this an axon or a dendrite? How can you tell? 12 2 You are examining another neuron, and find that it has two processes, both of which generate action potentials. What is the structural class of this neuron? How did you come to this conclusion? A damaged axon in the PNS may be able to regenerate only if the cell body is intact. Why do you think that the cell body must be intact for regeneration to occur? (Hint: Think about the function of the organelles and other structures located in the cell body.) 3
Explanation / Answer
Question 1- you are examining a neuronal process and you find that it generates action potencials. is this axon or a dendrite? how can you tell?
Answer- a typical neuron consist of nerve cell body, dendrits and axon.
Dendrite are only for receptive process. impulses can be transmitted from one dendrite to other but it cannot generate action potencial
Axon- the initial segment of axon is the site where action potencials are generated, and the axonal process transmitts it.
So the answer is the examinined structure is An Axon.
Question 2- You are examining another neuron,and find that it has two processes, both of which generate action potencials. what is the structural class of this neuron? how did you come to this conclusion?
Answer- Bipolar neurons
Neurons are classified into multipolar, bipolar and unipolar.
Multipolar has # or more processes and it constitutes 99% of neurons in human.
Bipolar neuronshave only 2 processes that extend in opposite directions.they are rare and are found in Retina of eye and olfactory system.
Question 3- A damaged axon in the PNS may be able to regenerate only if the cell body is intact, why do you think that the cell body must be intact for regeneration to occur?
Answer- Neurolemmocytes( Schwann Cells) are responsible for regeneration of neurons in PNS. only if cell body is intact. once the axon is severes, chemotactic factors are secreted by cell body which invites phagocytes to clear the debris. Later schwann cell secrete neurotrophic factors which enhances nerve growth and sprouts starts regenerating.
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