Myelin reduces membrane capacitance by increasing the thickness of the membrane

Question

Myelin reduces membrane capacitance by increasing the thickness of the membrane and thus increasing the separation of cations and anions.

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Question 21 pts

What are aspects that affect the propagation velocity?

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Question 31 pts

Match the term on the left with the term on the right. Use each answer choice only once.

Vesicles

      [ Choose ]            Insulator            5000 molecules of NTs            Electromagnetic field            Ion conductor      

Sodium

      [ Choose ]            Insulator            5000 molecules of NTs            Electromagnetic field            Ion conductor      

Lipid bilayer

      [ Choose ]            Insulator            5000 molecules of NTs            Electromagnetic field            Ion conductor      

Cytoplasm

      [ Choose ]            Insulator            5000 molecules of NTs            Electromagnetic field            Ion conductor      

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Question 41 pts

The movement of ions through their channels require a discharge of the capacitance.

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Question 51 pts

***This is an example of a test question***

Multiple sclerosis is a demyelinating disease of the central nervous system caused by antibodies that invade the central nervous system and bind to the myelinating cells. This has an affect on the signal propagation. You would expect to find antibodies on:

Explanation / Answer

Q1 it's a true statement because as the myline sheath covering the membrane of the neurone axolemma, there is any version of exchange of sodium and potassium through the myline sheath, increases electrical resistance and help in saltatory conduction , which help in the fast conduction of nerve impulse.

Q2 answer is B , membrane capacitance, the conduction velocity of the neurone is depend only and only on the diameter of the neurone and the myline covering and temperature but not on the length of neurone and electromagnetic field.

Q3 vesicles- 5000 molecule of Neurotransmitter

Sodium- iron conductor along with Potassium.

Lipid bilayer is a membrane insulator-maintain membrane potential.

Cytoplasm- cytoplasm act as a electromagnetic field.

Q4 its true statement that movement of the ions is occur only when the membrane capacitance fluctuates and the membrane potential changes which lead to movement of sodium and potassium across the membrane and action potential generated and propagate.

Q5 in multiple sclerosis autoantibodies are directed against the oligodendrocytes which form myline sheath in the central nervous system,

In the peripheral nervous system myline sheath is formed by the schwwan cell so peripheral nerves are not affected in the multiple sclerosis.

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