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PHY2011 - Neuroscience of communication, sensory and control systems - S1 2026

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A myelinated nerve fibre has a conduction velocity of 96 m/sec and internode lengths of 1.6 mm.

How long does it take an action potential to spread from one node of Ranvier to the next ?

Answer in milliseconds to 3 decimal places.

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A myelinated nerve fiber has a diameter of 10 um and a conduction velocity of 60 m/sec. What would you expect to be the diameter (in u

m) of a fibre which has a conduction velocity of 84 m/sec ?

Answer in whole numbers, with no decimal places.

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A large motor neuron with a diameter of 18 m

m has a conduction velocity of 107 m/sec. If its length from the spinal cord to the muscle it innervates is 1.2m, how long would it take an AP at the cell body (in the spinal cord) to reach the muscle ?

Answer in seconds to 3 decimal places.

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A Beaker is divided into two chambers, A and B, by a semi-permeable membrane lying across the middle of the beaker. Chamber A contains the following concentration of ions:

{Na⁺} = 22 mM, {K⁺} = 100 mM, {Cl^-} = 110 mM

Chamber B contains the following concentration of ions:

{Na⁺} = 99 mM, {K⁺} = 10 mM, {Cl^-} = 110 mM

If the membrane is permeable only to Na⁺, what is the transmembrane potential difference of Chamber A with respect to Chamber B?

Answer in whole numbers, with no decimal places. In your answer give only the numerical (asbolute) value - i.e., ignore the sign of the answer.

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The nerve supplying a cat soleus muscle consists of 517 myelinated axons, of which 60% are motor. Of these motor axons, 35% supply muscle spindles and, therefore, do not contribute to the force developed by the contracting muscle.

Of how many motor units is this soleus muscle composed ?

Answer in whole numbers, with no decimal places.