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Which of the following statements is correct for the 'Nodes of Ranvier' in nerves?

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Important Questions on Neural Control and Coordination

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Biology>Human Physiology>Neural Control and Coordination>Generation and Conduction of Nerve Impulse

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:

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Biology>Human Physiology>Neural Control and Coordination>Generation and Conduction of Nerve Impulse

Select the incorrect statement regarding synapses:

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Biology>Human Physiology>Neural Control and Coordination>Generation and Conduction of Nerve Impulse

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>Generation and Conduction of Nerve Impulse

Resting membrane potential of a neuron is approximately:

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Biology>Human Physiology>Neural Control and Coordination>Generation and Conduction of Nerve Impulse

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.

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Biology>Human Physiology>Neural Control and Coordination>Generation and Conduction of Nerve Impulse

Which of the following is secreted at the ends of an axon?

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Biology>Human Physiology>Neural Control and Coordination>Generation and Conduction of Nerve Impulse

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>Generation and Conduction of Nerve Impulse

Which of the following regions of the brain is incorrectly paired with its function?

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Biology>Human Physiology>Neural Control and Coordination>Generation and Conduction of Nerve Impulse

Nissl bodies are mainly composed of

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Biology>Human Physiology>Neural Control and Coordination>Generation and Conduction of Nerve Impulse

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>Generation and Conduction of Nerve Impulse

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

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Biology>Human Physiology>Neural Control and Coordination>Generation and Conduction of Nerve Impulse

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

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Biology>Human Physiology>Neural Control and Coordination>Generation and Conduction of Nerve Impulse

Neurotransmitter released at the neuromuscular junction of a voluntary muscles is:

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Biology>Human Physiology>Neural Control and Coordination>Generation and Conduction of Nerve Impulse

Which one of the following ion pairs is involved in nerve impulses?

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Biology>Human Physiology>Neural Control and Coordination>Generation and Conduction of Nerve Impulse

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