Exam (elaborations)
Action potential and nerve conduction & neuromuscular junction Questions with Correct Answers
- Course
- Institution
Action potential and nerve conduction & neuromuscular junction Questions with Correct Answers
[Show more]
Content preview
Action potential and nerve conduction & neuromuscularjunction Questions with Correct Answers
Neurons Correct Answer-are specialised cells that function to transmit
electrical impulses within the nervous system
Label the diagram of a neuron Correct Answer-
Draw a labelled diagram of a motor neuron. Correct Answer-a. cell body
- shown with a nucleus;
b. nucleus correctly labelled;
c. axon - shown as double line longer than the longest dendrite;
d. myelin sheath/Schwann cells - surrounding the axon;
e. nodes of Ranvier - shown in axon;
f. dendrites - shown extending from the cell body;
g. motor end plates - not covered by myelin sheath and ending with
buttons/dots;
,Basic structure Correct Answer-Dendrites - Short-branched fibres that
convert chemical information from other neurons or receptor cells into
electrical signals
Axon - An elongated fibre that transmits electrical signals to terminal
regions for communication with other neurons or effectors
Soma - A cell body containing the nucleus and organelles, where
essential metabolic processes occur to maintain cell survival
Do all neurons surrounded by a myelin sheath? Correct Answer-No
Role of myelin sheath Correct Answer-The myelin sheath improves the
conduction speed of electrical impulses along the axon, but require
additional space and energy
Saltatory conduction Correct Answer-action potentials jump from node
to node
Factors which affect speed of saltatory Correct Answer-Myelination -
myelinated AP will travel fast
Diameter - wider diameter = less resistance = faster
How do AP travel down demyelinated nerves? Correct Answer-In
unmyelinated axons, the action potential travels continuously along the
axons
, What is the function of neurons? Correct Answer-Neurons are
specialized cells that rapidly transmit electrical impulses from one
location in the body to another.
Neurons enable rapid internal communication, which is essential for
survival.
How do neurons generate and conduct electrical signals? Correct
Answer-By pumping positively charged ions (Na+ and K+) across their
membrane
The unequal distribution of ions on different sides of the membrane
creates a charge difference called a membrane potential
Resting potential Correct Answer-A resting potential is the difference in
charge across the membrane when a neuron is not firing
the potential difference (or voltage) across the plasma membrane when
the neuron is at rest.
State the value of the resting membrane potential Correct Answer--
70mV
What controls the resting membrane potential? Correct Answer-Na+ and
K+
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 cracker. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $12.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
75632 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now