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Unmyelinated nerve fibre enclosed by a Schwann cell is commonly found in

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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
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
Select the incorrect statement regarding synapses:
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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
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
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
Concentration of Na+ ions outside a nerve cell is ~ 100 times more than inside. The concentration of K+ ions is more inside the cells. The levels of Na+ ions and K+ ions are maintained by:
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Biology>Human Physiology>Neural Control and Coordination>Generation and Conduction of Nerve Impulse
Action potential in neurons is generated by a rapid influx of
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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.

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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
The transport of which neutrotransmitter is interfered by cocaine?
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Biology>Human Physiology>Neural Control and Coordination>Generation and Conduction of Nerve Impulse
Receptor sites for neurotransmitters are present on
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Biology>Human Physiology>Neural Control and Coordination>Generation and Conduction of Nerve Impulse
Which one of the following pair of structures distinguishes a nerve cell from other types of cell?
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Biology>Human Physiology>Neural Control and Coordination>Generation and Conduction of Nerve Impulse
A bipolar neuron has
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Biology>Human Physiology>Neural Control and Coordination>Generation and Conduction of Nerve Impulse
In the central nervous system, myelinated fibres form the ..., while the non-myelinated fibre cells form the ......
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Biology>Human Physiology>Neural Control and Coordination>Generation and Conduction of Nerve Impulse
Myelinated nerve fibres are white coloured because of:
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Biology>Human Physiology>Neural Control and Coordination>Generation and Conduction of Nerve Impulse
Four healthy people in their twenties got involved in injuries resulting in damage and death of few cells of the following. Which of the cells are the least likely to be replaced by new cells?
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Biology>Human Physiology>Neural Control and Coordination>Generation and Conduction of Nerve Impulse
Longest cell in human body may be
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Biology>Human Physiology>Neural Control and Coordination>Generation and Conduction of Nerve Impulse
The nerves leading to the central nervous system are called :-