Exam (elaborations)
Bio 669 Quiz 2 With Complete Solution
- Course
- Institution
Bio 669 Quiz 2 With Complete Solution...
[Show more]
Seller
Follow
Content preview
Bio 669 Quiz 2 With Complete SolutionNeuron is composed of - ANSWER cell body, dendrites, axon
a. densely packed cell bodies in the CNS are called _____ - ANSWER nuclei
b. densely packed cell bodies in the PNS are called _____ - ANSWER Ganglia
What are dendrites? - ANSWER Receptive portions of the neuron; receives information
What do axons do? - ANSWER Carry impulses away from the cell body
is membrane potential about the inside of the cell or the outside? ANSWER inside of the
cell
what is an electrochemical gradient? ANSWER describes the forces that affect ion
movement if it is allowed to become permeable across a membrane
when does action potential start? ANSWER when a membrane is depolarized enough
that it opens voltage-gated ion channels
What is a graded potential? - ANSWER changes in membrane potential that decreases
over distance
what Is a refectory period? - ANSWER a period immediately following stimulation that is
unresponsive for some time.
Reduced sensitivity
What is myelin? - ANSWER A segmented layer of lipid material, acts as insulation.
, what is myelin called in the PNS? - ANSWER Schwann cells
What are the nodes of Ranvier? ANSWER gaps/regular interruptions in the myelin
sheath
What is saltatory conduction? ANSWER The flow of ions between segments of myelin
rather than alone the entire length of the axon. Like playing leap frog.
What is divergence? ANSWER ability of branching axons to influence many neurons
What is convergence? ANSWER Branches of numerous neurons converging on one or a
few neurons
CNS consists of - ANSWER brain and spinal cord
PNS consists of- ANSWER cranial nerves and spinal nerves
afferent pathways are_____ - ANSWER ascending
efferent pathways are _____ - ANSWER descending
What is the function of the somatic nervous system? - ANSWER motor and sensory
pathways that govern voluntary motor control of the skeletal muscles
What is the role of the autonomic nervous system? -ANSWER motor and sensory
pathways that control the body's internal environment via involuntary control or organ
systems
What is Wallerian degeneration? -ANSWER degeneration of a nerve fiber that has been
transected by an injury or disease
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Chrisyuis. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $8.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
79276 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now