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Neurosecretion of neurotransmitter from ...

Neurosecretion of neurotransmitter from the synaptic vesicles is triggered by `Ca^(++)//Mg^(++)` ions.

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`Ca_(++)` ions
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Which option is correct for conduction of nerve impulse along chemical synapse? i. At synapse, the membranes of the pre and postsynaptic neurons are separated by a fluid-filled space called synaptic cleft ii. Chemicals called neurotransmitters are incolved in the transmission of impulses at these synapses iii. The axom terminals contain vesicles filled with these neurotransmitters iv. When an impulse arrives at the axon terminal, synaptic vesicles release their neurotransmitters in the synaptic cleft. v. The release neurotransmitters bind to their specific receptors, present on the pre-synaptic membrane. vi. Opens ion channels allowing the entry of ions which can generate a new potential in the postsynaptic neuron vii. The new potential developed is only excitatory

Assertion Arival of an impulse at the axon terminal stimulates the release of neurotransmitters in synaptic cleft. Reason These neurotransmitters are responible for the opening of ion channels.

Assertion :- A neurotransmitter crosses the synapse and attaches to receptors on the post synaptic cell. Reason:- Depending on the neurotransmitter, it may excite or inhibit the post synaptic cell.