Advertisements
Advertisements
प्रश्न
Give function of astrocytes in nervous system.
Advertisements
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
Compare the following:
Resting potential and action potential
Give a brief account of Mechanism of synaptic transmission.
Long answer question.
Explain the process of conduction of nerve impulses up to the development of action potential.
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?
Potential difference across resting membrane is negative. This is due to differential distribution of the following ions ______.
Explain the process of the transport and release of a neurotransmitter with the help of a labelled diagram showing a complete neuron, axon terminal and synapse.
During the phase of depolarisation of nerve impulse, ______.
