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प्रश्न
Give function of astrocytes in nervous system.
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उत्तर
Astrocytes have varied roles in the brain, secretion and absorption of neural transmitter and maintenance of blood-brain barrier BBB. They also regulate the transmission of electrical impulses with the brain.
संबंधित प्रश्न
Give a brief account of Mechanism of synaptic transmission.
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 |
Dendrites transmit impulse ______ cell body and axon transmit impulse ______ cell body.
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 |
Under which of the following conditions will the ionic gradients across the resting membrane be maintained?
Identify the correct path of transmission of nerve impulse.
When stimulus is applied to a membrane of neuron, it causes rapid influx of ____________.
Resting membrane potential is maintained by ______.
During resting potential, the axonal membrane is polarised, indicate the movement of +ve and –ve ions leading to polarisation diagrammatically.
During the phase of depolarisation of nerve impulse, ______.
