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Answer.

a. Propagation (Conduction of nerve impulse); A nerve is aware to depolarization the axonic membrane, thus occur when the membrane become permeable to ions by which sodium ion rush in and potassium ion rush out.  Any stimulus such as mechanical, chemical, thermal or electrical can lead the membrane to he sensitive and to allow it’s propagation along the axon.

b. All or Northing law; It state that ‘A responsee of an excitable unit is independent to the intensity of the atinulus’. This means that weak or strong stimulus cab be transmitted constantly along the axon.  A body find the way to differentiate between the strong and weak stimulus, this can be differentiate only by conduction if frequency’s cord in which a strong stimulus have a great frequency.

c. Speed of conduction; A myelinated neurone can transmit impulse very rapidly than non myelinated neurone. In myelinated membrane there is smaller diameter of passing ions which create great resistance, so ions jump to influx into the membrane across node if ranvier in myelinated membrane.

d. Refractory Period; It is a period occur during hyperpolarization which prevent transmission of another impulse due to the delaying of potassium gate being closed.

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