Define/Explain the following terms:
$(1)$ Synapse
$(2)$ Node of Ranvier
$(1)$ Synapse
$(2)$ Node of Ranvier
(N/A) $(1)$ $A$ synapse is a junction between two neurons,formed by the membranes of a pre-synaptic neuron and a post-synaptic neuron,which may or may not be separated by a synaptic cleft.
$(2)$ Myelinated nerve fibres are enveloped with Schwann cells,which form a myelin sheath around the axon. The gaps between two adjacent myelin sheaths are called nodes of Ranvier.
$(2)$ Myelinated nerve fibres are enveloped with Schwann cells,which form a myelin sheath around the axon. The gaps between two adjacent myelin sheaths are called nodes of Ranvier.
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$A$ nerve impulse is transmitted from one neuron to another through the junctions called
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View SolutionAcetylcholine is:
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View SolutionArrange the following events in proper sequence during impulse transmission across a chemical synapse:
$(a)$ Fusion of synaptic vesicles with the cell membrane of the presynaptic neuron.
$(b)$ $Ca^{++}$ channels open and $Ca^{++}$ diffuses into the synaptic knob from the extracellular fluid.
$(c)$ Neurotransmitter binds with receptors of the postsynaptic cell.
$(d)$ Release of neurotransmitter by exocytosis.
$(a)$ Fusion of synaptic vesicles with the cell membrane of the presynaptic neuron.
$(b)$ $Ca^{++}$ channels open and $Ca^{++}$ diffuses into the synaptic knob from the extracellular fluid.
$(c)$ Neurotransmitter binds with receptors of the postsynaptic cell.
$(d)$ Release of neurotransmitter by exocytosis.
Assertion $(A) :-$ Impulse transmission across an electrical synapse is always faster than that across a chemical synapse.
Reason $(R) :-$ Electrical current can flow directly from one neuron into the other across electrical synapses.
Reason $(R) :-$ Electrical current can flow directly from one neuron into the other across electrical synapses.
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View SolutionWhat is the junction between the axon of one neuron and the dendrite of another neuron called?
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