The aciton potential (cells of NS) Flashcards

1
Q

What is the action potential?

A
  • Transient change in membrane potential capable of nondecremental self propagation along an axon of the neurone
  • Allows neurones to communicate w other neurones
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2
Q

What are the properties of an action potential?

A
  • Robust
  • Rapid
  • Orthodromic
  • All or nothing
  • Frequency encoded
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3
Q

What can you use to measure an AP?

A

Extracellular electrophysiology

Erlanger & Gasser, 1920s used this

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4
Q

What is compound action potential (CAP)?

A

Population response, sum of APs from all the axons simultaneously contributing to the signal

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5
Q

What did Hodgkin and Huxley (1939) use to study APs?

A

Intracellular electrophysiology

(Inserted an electrode into the axoplasm)

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6
Q

What are the 6 parts elements of an AP happening?

A
  • Resting
  • Depolarisation
  • (Overshoot)
  • Peak
  • Repolarisation
  • After hyperpolarisation
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7
Q

What is overshoot?

A

How far the membrane potential goes past the threshold

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