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प्रश्न
Write a short note on the following:
Synapse
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उत्तर
- A nerve impulse is transmitted from one neuron to another through junctions called synapses.
- A synapse is formed by the membranes of a pre-synaptic neuron and a post-synaptic neuron, which may or may not be separated by a gap called synaptic cleft.
- There are two types of synapses, namely, electrical synapses and chemical synapses.
संबंधित प्रश्न
Explain the following process:
Transmission of a nerve impulse across a chemical synapse
Give a brief account of Mechanism of synaptic transmission.
Explain the role of Na+ in the generation of action potential.
Sketch and label formation of typical spinal nerve.
Dendrites transmit impulse ______ cell body and axon transmit impulse ______ cell body.
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 situations is responsible for resting membrane potential?
When stimulus is applied to a membrane of neuron, it causes rapid influx of ____________.
Potential difference across resting membrane is negative. This is due to differential distribution of the following ions ______.
Complete the statement by choosing appropriate match among the following -
| a. Resting potential | i. Chemicals involved in the transmission of impulses at synapses. |
| b. Nerve impulse | ii. Gap between the pre synaptic and post synaptic neurons |
| c. Synaptic cleft | iii. Electrical potential difference across the resting neural membrane |
| d. Neurotransmitters | iv. An electrical wave like response of a neuron to a stimulation |
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.
The electronegativity inside the membrane is due to
