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During the propagation of a nerve impulse, the action potential results from the movement of
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Important Questions on Neural Control and Coordination
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During the transmission of nerve impulse through a nerve fibre, the potential on the inner side of the plasma membrane has which type of electric charge?
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Saltatory conduction of impulse occurs in
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Read the given statements and select the correct ones.
(i) Autonomic neural system transmits impulses from the CNS to the voluntary organs and, striated muscles of the body.
(ii) Unmyelinated nerve fibres do not have Schwann cells that form the myelin sheath.
(iii) Axonal membrane of a neuron, while not conducting any impulse, is comparatively more permeable to potassium ions than to sodium ions
(iv) A synapse is formed by the membranes of a pre-synaptic neuron and a postsynaptic neuron.
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The junction between the axon of one neuron and the dendrite of the next is called
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Which of the following statements is /are incorrect about the electrical synapse?
(i) At electrical synapses, the membranes of pre- and post-synaptic neurons are in very proximity.
(ii) Electrical current can flow directly from one neuron into the other across the synapses.
(iii) Transmission of an impulse across electrical synapses is very similar to impulse conduction along a single axon.
(iv) Electrical synapses pass an electrical signal between cells with the use of neurotransmitters.
(v) Electrical synapses are fast.
(vi) Electrical synapses are rare in our system.
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Nerve fibres transmit the nerve message by _____ means.
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A list of events occurring in the transmission of nerve impulse across the synapse is given below in a random order.
(i) Opening of specific ion channels allows the entry of ions, a new action potential is generated in the post-synaptic neuron.
(ii) Neurotransmitter binds to the receptor on post synaptic membrane.
(iii) Synaptic vesicle fuses with pre-synaptic membrane, neurotransmitter release into synaptic cleft.
(iv) Depolarisation of pre-synaptic membrane.
(v) Arrival of action potential at axon terminal.
Which of the following options represents these events in a correct order?
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The given diagram shows axon terminal. Select the option that correctly matches the steps in transmission of impulses (list i - vii) with the labellings (A - C) in diagram.
(i) Chemicals called neurotransmitters are released in the synaptic cleft through ion channels.
(ii) When an impulse arrives at the axon terminal, it stimulates the movement of synaptic vesicles.
(iii) Neurotransmitters are endocytosed into the neurons.
(iv) The ion channels dose with the binding of neurotransmitters to their specific receptors vesicles.
(v) Synaptic vesicles move towards the membrane where they fuse with the plasma membrane.
(vi) Neurotransmitters are released in the synaptic cleft.
(vii) The released transmitters bind to their specific receptors on postsynaptic membrane.
