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

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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.

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What is the molarity, in M, of a 1.88% w/v KCl solution.

The formula weight of KCl is 74.55.

Answer to 3 decimal places. Do not enter units in your answer.

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The number of millimoles of NaOH needed to make 411 ml of a 0.57 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 696 ml of a 0.38 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 is the percentage concentration of a solution 0.4 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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What weight of glucose, in grams, is required to make 1 litre of a 197 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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The knee jerk reflex involves stretch of the Achilles tendon

With respect to the image below which shows the flow of somatic sensory information from the periphery into the spinal cord, which of the following types of somatic information flows in the manner shown in panel B?

Somatic spinal cord pathways image