284605
The release of chemical messenger from synaptic vesicles is under the influence of these ion (s).
1 \(\mathrm{Cl}^{-}\)
2 \(\mathrm{Fe}^{++}\)and \(\mathrm{S}^{++}\)
3 \(\mathrm{Ca}^{++}\)
4 \(\mathrm{Mg}^{++}\)and \(\mathrm{Sr}^{++}\)
Explanation:
C When an impulse reach at synaptic knob of the axon, it depolarize the presynaptic membrane and increases its permeability to calcium ions \(\left(\mathrm{Ca}^{2+}\right)\). From the synaptic cleft \(\mathrm{Ca}^{2+}\) pass into the synaptic knob via voltage gated channels. Sudden elevation in the cytosolic concentration of \(\mathrm{Ca}^{2+}\) causes the release of a chemical called neurotransmitter. Synaptic vesicles present into the synaptic cleft by exocytosis through the presynaptic membrane.
AIIMS-2012
Neural Control and Coordination
284606
Neurotransmitter released by
1 Axon terminal
2 Dendrite
3 Cell body
4 Myelin sheath
Explanation:
A Neurotransmitters are released by the axon terminal when their vesicles "fuse" with the membrane of the axon terminal, spilling of the neurotransmitter present into the synaptic cleft. - Neurotransmitters are released from synaptic vesicles in pre-synaptic neurons in response to neural activity, diffuse across the synaptic cleft, and bind specific receptors in order to bring about changes in postsynaptic neurons.
AIIMS-26.05.2019 Shift-II
Neural Control and Coordination
284607
Node of Ranvier occurs where:
1 Nerve is covered with myelin sheath
2 Neurilemma is discontinuous
3 Neurilemma and myelin sheath are discontinuous
4 Myelin sheath is discontinuous
Explanation:
D Node of Ranvier are found in myelinated nerve fibres. These are the gaps between two adjacent myelin sheaths. Node of Ranvier is a gap in the insulating myelin sheath that brings about rapid conduction of nerve impulses.
AIIMS-2015
Neural Control and Coordination
284608
Unidirectional transmission of a nerve impulse through nerve fibre is due to the fact that
1 Nerve fibre is insulated by a medullary sheath
2 Sodium pump starts operating only at the cyton and then continues into the nerve fibre
3 Neurotransmitters are released by dendrites and not by axon endings
4 Neurotransmitters are released by the axon endings and not by dendrites.
Explanation:
D The unidirectional transmission of a nerve impulse through a nerve fibre is due to the fact that neurotransmitters are only released from the axon ending of the presynaptic neuron. The dendrites of the postsynaptic neuron do not have the receptors that are needed to bind to neurotransmitters. Therefore, the nerve impulse can only travel in one direction, for the post synaptic neuron.
AIIMS-2004
Neural Control and Coordination
284609
Afferent nerve fibres carry impulses from
1 Effector organs to CNS
2 Receptors to CNS
3 CNS to receptors
4 CNS to muscles
Explanation:
B Receptors are connected to the central nervous system by the afferent nerve fibers. Afferent nerve fibres are formed of only sensory nerve fibres, conduct nerve fibres, and conduct nerve impulses from sensory organs or receptors to central nervous system for producing sensation.
284605
The release of chemical messenger from synaptic vesicles is under the influence of these ion (s).
1 \(\mathrm{Cl}^{-}\)
2 \(\mathrm{Fe}^{++}\)and \(\mathrm{S}^{++}\)
3 \(\mathrm{Ca}^{++}\)
4 \(\mathrm{Mg}^{++}\)and \(\mathrm{Sr}^{++}\)
Explanation:
C When an impulse reach at synaptic knob of the axon, it depolarize the presynaptic membrane and increases its permeability to calcium ions \(\left(\mathrm{Ca}^{2+}\right)\). From the synaptic cleft \(\mathrm{Ca}^{2+}\) pass into the synaptic knob via voltage gated channels. Sudden elevation in the cytosolic concentration of \(\mathrm{Ca}^{2+}\) causes the release of a chemical called neurotransmitter. Synaptic vesicles present into the synaptic cleft by exocytosis through the presynaptic membrane.
AIIMS-2012
Neural Control and Coordination
284606
Neurotransmitter released by
1 Axon terminal
2 Dendrite
3 Cell body
4 Myelin sheath
Explanation:
A Neurotransmitters are released by the axon terminal when their vesicles "fuse" with the membrane of the axon terminal, spilling of the neurotransmitter present into the synaptic cleft. - Neurotransmitters are released from synaptic vesicles in pre-synaptic neurons in response to neural activity, diffuse across the synaptic cleft, and bind specific receptors in order to bring about changes in postsynaptic neurons.
AIIMS-26.05.2019 Shift-II
Neural Control and Coordination
284607
Node of Ranvier occurs where:
1 Nerve is covered with myelin sheath
2 Neurilemma is discontinuous
3 Neurilemma and myelin sheath are discontinuous
4 Myelin sheath is discontinuous
Explanation:
D Node of Ranvier are found in myelinated nerve fibres. These are the gaps between two adjacent myelin sheaths. Node of Ranvier is a gap in the insulating myelin sheath that brings about rapid conduction of nerve impulses.
AIIMS-2015
Neural Control and Coordination
284608
Unidirectional transmission of a nerve impulse through nerve fibre is due to the fact that
1 Nerve fibre is insulated by a medullary sheath
2 Sodium pump starts operating only at the cyton and then continues into the nerve fibre
3 Neurotransmitters are released by dendrites and not by axon endings
4 Neurotransmitters are released by the axon endings and not by dendrites.
Explanation:
D The unidirectional transmission of a nerve impulse through a nerve fibre is due to the fact that neurotransmitters are only released from the axon ending of the presynaptic neuron. The dendrites of the postsynaptic neuron do not have the receptors that are needed to bind to neurotransmitters. Therefore, the nerve impulse can only travel in one direction, for the post synaptic neuron.
AIIMS-2004
Neural Control and Coordination
284609
Afferent nerve fibres carry impulses from
1 Effector organs to CNS
2 Receptors to CNS
3 CNS to receptors
4 CNS to muscles
Explanation:
B Receptors are connected to the central nervous system by the afferent nerve fibers. Afferent nerve fibres are formed of only sensory nerve fibres, conduct nerve fibres, and conduct nerve impulses from sensory organs or receptors to central nervous system for producing sensation.
284605
The release of chemical messenger from synaptic vesicles is under the influence of these ion (s).
1 \(\mathrm{Cl}^{-}\)
2 \(\mathrm{Fe}^{++}\)and \(\mathrm{S}^{++}\)
3 \(\mathrm{Ca}^{++}\)
4 \(\mathrm{Mg}^{++}\)and \(\mathrm{Sr}^{++}\)
Explanation:
C When an impulse reach at synaptic knob of the axon, it depolarize the presynaptic membrane and increases its permeability to calcium ions \(\left(\mathrm{Ca}^{2+}\right)\). From the synaptic cleft \(\mathrm{Ca}^{2+}\) pass into the synaptic knob via voltage gated channels. Sudden elevation in the cytosolic concentration of \(\mathrm{Ca}^{2+}\) causes the release of a chemical called neurotransmitter. Synaptic vesicles present into the synaptic cleft by exocytosis through the presynaptic membrane.
AIIMS-2012
Neural Control and Coordination
284606
Neurotransmitter released by
1 Axon terminal
2 Dendrite
3 Cell body
4 Myelin sheath
Explanation:
A Neurotransmitters are released by the axon terminal when their vesicles "fuse" with the membrane of the axon terminal, spilling of the neurotransmitter present into the synaptic cleft. - Neurotransmitters are released from synaptic vesicles in pre-synaptic neurons in response to neural activity, diffuse across the synaptic cleft, and bind specific receptors in order to bring about changes in postsynaptic neurons.
AIIMS-26.05.2019 Shift-II
Neural Control and Coordination
284607
Node of Ranvier occurs where:
1 Nerve is covered with myelin sheath
2 Neurilemma is discontinuous
3 Neurilemma and myelin sheath are discontinuous
4 Myelin sheath is discontinuous
Explanation:
D Node of Ranvier are found in myelinated nerve fibres. These are the gaps between two adjacent myelin sheaths. Node of Ranvier is a gap in the insulating myelin sheath that brings about rapid conduction of nerve impulses.
AIIMS-2015
Neural Control and Coordination
284608
Unidirectional transmission of a nerve impulse through nerve fibre is due to the fact that
1 Nerve fibre is insulated by a medullary sheath
2 Sodium pump starts operating only at the cyton and then continues into the nerve fibre
3 Neurotransmitters are released by dendrites and not by axon endings
4 Neurotransmitters are released by the axon endings and not by dendrites.
Explanation:
D The unidirectional transmission of a nerve impulse through a nerve fibre is due to the fact that neurotransmitters are only released from the axon ending of the presynaptic neuron. The dendrites of the postsynaptic neuron do not have the receptors that are needed to bind to neurotransmitters. Therefore, the nerve impulse can only travel in one direction, for the post synaptic neuron.
AIIMS-2004
Neural Control and Coordination
284609
Afferent nerve fibres carry impulses from
1 Effector organs to CNS
2 Receptors to CNS
3 CNS to receptors
4 CNS to muscles
Explanation:
B Receptors are connected to the central nervous system by the afferent nerve fibers. Afferent nerve fibres are formed of only sensory nerve fibres, conduct nerve fibres, and conduct nerve impulses from sensory organs or receptors to central nervous system for producing sensation.
NEET Test Series from KOTA - 10 Papers In MS WORD
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Neural Control and Coordination
284605
The release of chemical messenger from synaptic vesicles is under the influence of these ion (s).
1 \(\mathrm{Cl}^{-}\)
2 \(\mathrm{Fe}^{++}\)and \(\mathrm{S}^{++}\)
3 \(\mathrm{Ca}^{++}\)
4 \(\mathrm{Mg}^{++}\)and \(\mathrm{Sr}^{++}\)
Explanation:
C When an impulse reach at synaptic knob of the axon, it depolarize the presynaptic membrane and increases its permeability to calcium ions \(\left(\mathrm{Ca}^{2+}\right)\). From the synaptic cleft \(\mathrm{Ca}^{2+}\) pass into the synaptic knob via voltage gated channels. Sudden elevation in the cytosolic concentration of \(\mathrm{Ca}^{2+}\) causes the release of a chemical called neurotransmitter. Synaptic vesicles present into the synaptic cleft by exocytosis through the presynaptic membrane.
AIIMS-2012
Neural Control and Coordination
284606
Neurotransmitter released by
1 Axon terminal
2 Dendrite
3 Cell body
4 Myelin sheath
Explanation:
A Neurotransmitters are released by the axon terminal when their vesicles "fuse" with the membrane of the axon terminal, spilling of the neurotransmitter present into the synaptic cleft. - Neurotransmitters are released from synaptic vesicles in pre-synaptic neurons in response to neural activity, diffuse across the synaptic cleft, and bind specific receptors in order to bring about changes in postsynaptic neurons.
AIIMS-26.05.2019 Shift-II
Neural Control and Coordination
284607
Node of Ranvier occurs where:
1 Nerve is covered with myelin sheath
2 Neurilemma is discontinuous
3 Neurilemma and myelin sheath are discontinuous
4 Myelin sheath is discontinuous
Explanation:
D Node of Ranvier are found in myelinated nerve fibres. These are the gaps between two adjacent myelin sheaths. Node of Ranvier is a gap in the insulating myelin sheath that brings about rapid conduction of nerve impulses.
AIIMS-2015
Neural Control and Coordination
284608
Unidirectional transmission of a nerve impulse through nerve fibre is due to the fact that
1 Nerve fibre is insulated by a medullary sheath
2 Sodium pump starts operating only at the cyton and then continues into the nerve fibre
3 Neurotransmitters are released by dendrites and not by axon endings
4 Neurotransmitters are released by the axon endings and not by dendrites.
Explanation:
D The unidirectional transmission of a nerve impulse through a nerve fibre is due to the fact that neurotransmitters are only released from the axon ending of the presynaptic neuron. The dendrites of the postsynaptic neuron do not have the receptors that are needed to bind to neurotransmitters. Therefore, the nerve impulse can only travel in one direction, for the post synaptic neuron.
AIIMS-2004
Neural Control and Coordination
284609
Afferent nerve fibres carry impulses from
1 Effector organs to CNS
2 Receptors to CNS
3 CNS to receptors
4 CNS to muscles
Explanation:
B Receptors are connected to the central nervous system by the afferent nerve fibers. Afferent nerve fibres are formed of only sensory nerve fibres, conduct nerve fibres, and conduct nerve impulses from sensory organs or receptors to central nervous system for producing sensation.
284605
The release of chemical messenger from synaptic vesicles is under the influence of these ion (s).
1 \(\mathrm{Cl}^{-}\)
2 \(\mathrm{Fe}^{++}\)and \(\mathrm{S}^{++}\)
3 \(\mathrm{Ca}^{++}\)
4 \(\mathrm{Mg}^{++}\)and \(\mathrm{Sr}^{++}\)
Explanation:
C When an impulse reach at synaptic knob of the axon, it depolarize the presynaptic membrane and increases its permeability to calcium ions \(\left(\mathrm{Ca}^{2+}\right)\). From the synaptic cleft \(\mathrm{Ca}^{2+}\) pass into the synaptic knob via voltage gated channels. Sudden elevation in the cytosolic concentration of \(\mathrm{Ca}^{2+}\) causes the release of a chemical called neurotransmitter. Synaptic vesicles present into the synaptic cleft by exocytosis through the presynaptic membrane.
AIIMS-2012
Neural Control and Coordination
284606
Neurotransmitter released by
1 Axon terminal
2 Dendrite
3 Cell body
4 Myelin sheath
Explanation:
A Neurotransmitters are released by the axon terminal when their vesicles "fuse" with the membrane of the axon terminal, spilling of the neurotransmitter present into the synaptic cleft. - Neurotransmitters are released from synaptic vesicles in pre-synaptic neurons in response to neural activity, diffuse across the synaptic cleft, and bind specific receptors in order to bring about changes in postsynaptic neurons.
AIIMS-26.05.2019 Shift-II
Neural Control and Coordination
284607
Node of Ranvier occurs where:
1 Nerve is covered with myelin sheath
2 Neurilemma is discontinuous
3 Neurilemma and myelin sheath are discontinuous
4 Myelin sheath is discontinuous
Explanation:
D Node of Ranvier are found in myelinated nerve fibres. These are the gaps between two adjacent myelin sheaths. Node of Ranvier is a gap in the insulating myelin sheath that brings about rapid conduction of nerve impulses.
AIIMS-2015
Neural Control and Coordination
284608
Unidirectional transmission of a nerve impulse through nerve fibre is due to the fact that
1 Nerve fibre is insulated by a medullary sheath
2 Sodium pump starts operating only at the cyton and then continues into the nerve fibre
3 Neurotransmitters are released by dendrites and not by axon endings
4 Neurotransmitters are released by the axon endings and not by dendrites.
Explanation:
D The unidirectional transmission of a nerve impulse through a nerve fibre is due to the fact that neurotransmitters are only released from the axon ending of the presynaptic neuron. The dendrites of the postsynaptic neuron do not have the receptors that are needed to bind to neurotransmitters. Therefore, the nerve impulse can only travel in one direction, for the post synaptic neuron.
AIIMS-2004
Neural Control and Coordination
284609
Afferent nerve fibres carry impulses from
1 Effector organs to CNS
2 Receptors to CNS
3 CNS to receptors
4 CNS to muscles
Explanation:
B Receptors are connected to the central nervous system by the afferent nerve fibers. Afferent nerve fibres are formed of only sensory nerve fibres, conduct nerve fibres, and conduct nerve impulses from sensory organs or receptors to central nervous system for producing sensation.
