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Which of the following statements about electrical synapse are correct?

$(i)$ At electrical synapses, the membranes of pre-synaptic and post-synaptic neurons are in very close contact.

$(ii)$ During electrical synapse, the chemical flows directly from one neuron to other across the synapse.

$(iii)$ The transmission of impulse across electrical synapse is faster than that of chemical synapse.

$(iv)$ Electrical synapse and chemical synapse works simultaneously.

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Important Questions on Neural Control and Coordination

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Biology>Human Physiology>Neural Control and Coordination>Neuron-The Structural and Functional Unit of Neural System

Assertion (A): Impulse transmission across electrical synapse is always faster than that of chemical synapse.

Reason (R): In electrical synapse, pre and post synaptic membranes are in very close proximity and have links called gap functions.

The correct option among the following is

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Biology>Human Physiology>Neural Control and Coordination>Neuron-The Structural and Functional Unit of Neural System

Identify $A, B, C$ and $D$ in the following graph regarding nerve impulse transmission.

Question Image

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Biology>Human Physiology>Neural Control and Coordination>Neuron-The Structural and Functional Unit of Neural System

When 'A' stands for Axon, 'D' for Dendrites, 'S' for Synapse and 'B' for Cell body, a typical sequence of structures between a receptor and an efferent is

HARD

Biology>Human Physiology>Neural Control and Coordination>Neuron-The Structural and Functional Unit of Neural System

Explain the plasma membrane of a nerve cell with respect to the maintenance of potential.

EASY

Biology>Human Physiology>Neural Control and Coordination>Neuron-The Structural and Functional Unit of Neural System

Assertion ( $A$ ): In myelinated nerve fibres, action potentials are conducted at a faster rate.

Reason ( $R$ ): The myelin present between nodes of Ranvier has concentrated $Na$ and $K$ voltage-gated channels.

EASY

Biology>Human Physiology>Neural Control and Coordination>Neuron-The Structural and Functional Unit of Neural System

Give an account of synaptic transmission.

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Biology>Human Physiology>Neural Control and Coordination>Neuron-The Structural and Functional Unit of Neural System

Action potential in neurons is generated by a rapid influx of

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Biology>Human Physiology>Neural Control and Coordination>Neuron-The Structural and Functional Unit of Neural System

Select the incorrect statement regarding synapses:

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Biology>Human Physiology>Neural Control and Coordination>Neuron-The Structural and Functional Unit of Neural System

Nissl bodies are mainly composed of

EASY

Biology>Human Physiology>Neural Control and Coordination>Neuron-The Structural and Functional Unit of Neural System

Concentration of

N a^{+}

ions outside a nerve cell is

~ 100

times more than inside. The concentration of

K^{+}

ions is more inside the cells. The levels of

N a^{+}

ions and

K^{+}

ions are maintained by:

EASY

Biology>Human Physiology>Neural Control and Coordination>Neuron-The Structural and Functional Unit of Neural System

Give an account of synaptic transmission,

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Biology>Human Physiology>Neural Control and Coordination>Neuron-The Structural and Functional Unit of Neural System

Stimulation of a muscle fiber by a motor neuron occurs at:

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Biology>Human Physiology>Neural Control and Coordination>Neuron-The Structural and Functional Unit of Neural System

Each neuron has a cell body, axon, and dendrites. The dendrites are the protoplasmic extensions of the nerve cell. The axodendritic type of chemical synapse is formed by the association between the axon terminal of the pre-synaptic neuron and the dendrites of a post-synaptic neuron. The action potential causes the fusion of the synaptic vesicle to release the neurotransmitters for neurotransmission. Select the correct option from the following.

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Biology>Human Physiology>Neural Control and Coordination>Neuron-The Structural and Functional Unit of Neural System

Resting membrane potential of a neuron is approximately:

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Biology>Human Physiology>Neural Control and Coordination>Neuron-The Structural and Functional Unit of Neural System

The correct pathway of conduction of impulses through a neuron is :

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Biology>Human Physiology>Neural Control and Coordination>Neuron-The Structural and Functional Unit of Neural System

Destruction of the anterior horn cells of the spinal cord would result in loss of:

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Biology>Human Physiology>Neural Control and Coordination>Neuron-The Structural and Functional Unit of Neural System

Myelin sheath is produced by