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PHY2011 - Neuroscience of communication, sensory and control systems - S1 2025

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The nerve supplying a cat soleus muscle consists of 511 myelinated axons, of which 66% are motor. Of these motor axons, 31% 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.

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A myelinated nerve fibre has a conduction velocity of 80 m/sec and internode lengths of 1.2 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 102 m/sec ?

Answer in whole numbers, with no 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+} = 58 mM,, {K+} = 140 mM, {Cl-} = 100 mM, {A-} = 106 mM

Chamber B contains the following concentration of ions:

{Na+} = 200 mM,, {K+} = 18 mM, {Cl-} = 50 mM, {A-} = 152 mM

If the membrane is permeable only to K

+

, what is the transmembrane potential difference of Chamber A relative 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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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+} = 49 mM, {K+} = 100 mM, {Cl-} = 110 mM

Chamber B contains the following concentration of ions:

{Na+} = 111 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 number of millimoles of NaOH needed to make 720 ml of a 0.13 M solution is?

The formula weight of NaOH is 40.

Answer to 2 decimal places. Do not enter units in your answer.
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What weight of NaCl in grams is needed to make 277 ml of a 0.25 M solution.

The formula weight of NaCl is 58.44.

Answer to 3 decimal places. Do not enter units in your answer.
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What weight of glucose, in grams, is required to make 1 litre of a 57 mM solution.

The formula weight of glucose is 180.0

Answer to 2 decimal places. Do not enter units in your answer.
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What is the concentration as %w/v of a solution which contains 447 millimoles per litre of NaCl

The formula weight of NaCl is 58.44.

Answer to 3 decimal places. Do not enter units in your answer.
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What is the percentage concentration of a solution 0.9 M NaCl solution.

The formula weight of NaCl is 58.44.

Answer to 2 decimal places. Do not enter units in your answer.
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