EASY

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Apolar neurons are not found in dorsal root ganglion of spinal cord.

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Important Questions on Neural control and Coordination

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Biology>Human Physiology>Neural control and Coordination>Neurons and Nerves

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

MEDIUM

Biology>Human Physiology>Neural control and Coordination>Neurons and Nerves

Receptor sites for neurotransmitters are present on

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Biology>Human Physiology>Neural control and Coordination>Neurons and Nerves

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.

HARD

Biology>Human Physiology>Neural control and Coordination>Neurons and Nerves

How many of the given statements (i-vi) is /are incorrect about the electrical synapse?
(i) At electrical synapses, the membranes of pre and post synaptic neurons are in very close proximity.
(ii) Electrical current can flow directly from one neuron into the other across the synapses.
(iii) Transmission of an impulse across electrical synapses is very similar to impulse conduction along single axon.
(iv) Electrical synapses pass electrical signal between cells with the use of acetylcholine.
(v) Electrical synapses are fast.
(vi) Electrical synapses are rare in our system.

MEDIUM

Biology>Human Physiology>Neural control and Coordination>Neurons and Nerves

Identify the wrong statement:

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Biology>Human Physiology>Neural control and Coordination>Neurons and Nerves

In PNS, myelinated neurons

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Biology>Human Physiology>Neural control and Coordination>Neurons and Nerves

_____are neurocytes without dendrites and axons which only occur at the beginning of histogenesis. (Apolar nerve cells/Polar nerve cells)

MEDIUM

Biology>Human Physiology>Neural control and Coordination>Neurons and Nerves

The given figure shows the structure of a neuron. Select the option that correctly identifies the parts labelled as A to E.
Question Image

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Biology>Human Physiology>Neural control and Coordination>Neurons and Nerves

Four healthy people in their twenties got involved in injuries resulting in damage and death of a few cells. Which of the cells are least likely to be replaced by new cells?

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Biology>Human Physiology>Neural control and Coordination>Neurons and Nerves

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>Neurons and Nerves

Node of Ranvier occurs where

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Biology>Human Physiology>Neural control and Coordination>Neurons and Nerves

The specialized part of the cell body of a neuron that connects to the axon is called

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Biology>Human Physiology>Neural control and Coordination>Neurons and Nerves

Select the correct statement regarding the Schwann cells

MEDIUM

Biology>Human Physiology>Neural control and Coordination>Neurons and Nerves

Four healthy friends in their thirties had an accident and got injuried. It resulted in damage and death of a few cells in their body. Which of the cells are least likely to be replaced by new cells?

MEDIUM

Biology>Human Physiology>Neural control and Coordination>Neurons and Nerves

In which type of neuron, two adjacent myelin sheaths are present, separated by gaps, and these gaps are called

EASY

Biology>Human Physiology>Neural control and Coordination>Neurons and Nerves

Which one of the following pairs of structures distinguishes a nerve cell from other types of cells?

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Biology>Human Physiology>Neural control and Coordination>Neurons and Nerves

Which of the following is a correct statement?

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Biology>Human Physiology>Neural control and Coordination>Neurons and Nerves

Which of the following is an incorrect statement?