In order to study the characteristics of a nerve an before and after it passes t

Question

In order to study the characteristics of a nerve an before and after it passes through the spinal cord, we use the experimental set up presented in document and The experimental set up document shows the location of the stimulating electrodes the afferent fibers and of recording electrodes on different recording the effect of stimulations or more one fibers, 02 and o permit recording the electric M2 respectively at the level of the Axon of MI recording the electric activity at the level of the axon of motor neuron MI Time separating the two Responses emulations Experiment 1 We apply two successive effective stimulations on one of the afferent fibers Fall, and we vary the time between these two stimulations. The results, recorded by 02, are shown in 1- Interpret the results obtained in document 2. increasing 2: We apply of intensities on the afferent fibers and we record the results on the four oscilloscopes 2- Explain the recordings obtained by Compare the recordings obtained by 02 and O4. Draw out the corresponding characteristics AP: Action Potential of the nerve message. 4- Indicate the type of summation which is revealed by experiment 2 at the level of the motor neuron M1. Justify the answer. Each of the motor neurons MI and M2, innervates a muscle intervening in the chilblain reflex that extension of the foot. 5. specify, by referring to documents 1 and 3, and by using the acquired knowledge, the motor neuron innervating the flexor muscle. Justify the answer.

Explanation / Answer

1) In motor neuron, the action potential begins when the plasma membrane at the axon hillock is depolarised to the threshold level. Document 2 describes about the effect to two successive electrical stimulation applied to the motor neuron. At first, they are applied with an intreval of 5 ms (panel 1 of document 2). Gradually the time intreval was reduced successively (panel 2 and 3 of document 2). The motor neuron is not able to generate action potential with increased time intreval between two stimulus. Finally, when the time intreval between the two stimulus decreased and when the electrical activity reaches the threshold limit, action potential is generated in the motor neuron (panel 4 of document 2).

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