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Question
Complete the flowchart of the process of conduction of nerve impulses.
| Application of stimulus on a resting nerve |
| ⇓ |
| Permeability of membrane changes |
| ⇓ |
| ______________________________ |
| ⇓ |
| Positive ions inside axon increases |
| ⇓ |
| ________________________________ |
| ⇓ |
| Polarity reverses and depolarisation takes place |
| ⇓ |
| Repolarisation - potassium gates open |
| ⇓ |
| ______________________________ |
| ⇓ |
| ______________________________ |
| ⇓ |
| Axoplasm becomes negatively charged and ECF becomes positive |
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Solution
| Application of stimulus on a resting nerve |
| ⇓ |
| Permeability of membrane changes |
| ⇓ |
| Na+ ions diffuse into the neuron from the ECF |
| ⇓ |
| Positive ions inside axon increases |
| ⇓ |
|
Membrane potential changes from – 70mV to + 30mV |
| ⇓ |
| Polarity reverses and depolarisation takes place |
| ⇓ |
| Repolarisation - potassium gates open |
| ⇓ |
| K+ ions diffuse out of the axon |
| ⇓ |
| The inside of the membrane (becomes less and less positive) becomes negative once again |
| ⇓ |
| Axoplasm becomes negatively charged and ECF becomes positive |
RELATED QUESTIONS
Long answer question.
Explain the process of conduction of nerve impulses up to the development of action potential.
Define Saltatory conduction.
What are the number of Na+ ions pumped out, and K+ ions pumped into the cell, with respect to the Na+ - K+ pump?
Match the Column - I with Column - II:
| Column I | Column II | ||
| i. | P - wave | p. | Depolarisation of ventricles |
| ii. | QRS complex | q. | Repolarisation of ventricles |
| iii. | T - wave | r. | Coronary ischemia |
| s. | Development of atria | ||
| t. | Repolarisation of atria |
The axoplasm inside the axon contains high concentration of (i) ions and low concentration of _(ii)_ ions, during the resting state of the neuron.
What is the average potential difference across the nerve cell membrane?
Under which of the following conditions will the ionic gradients across the resting membrane be maintained?
Which of the following statements is TRUE for medullated nerve fibre?
During resting potential, the axonal membrane is polarised, indicate the movement of +ve and –ve ions leading to polarisation diagrammatically.
What is the difference between electrical transmission and chemical transmission?
