Tag: structure of neuron

Questions Related to structure of neuron

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

biology plant and animal tissues nervous system in animals structure of neuron structure and function of neuron

  1. Flagellum and medullary sheath

  2. Nucleus and mitochondria

  3. Perikaryon and dendrites

  4. Vacuoles and fibres

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Correct Option: C
Explanation:
  • The structural difference between a neuron and other kinds of cell include the perikaryon and dendrites.
  • The cell body of a neuron, known as perikaryon, has a large and round nucleus. Nissil granules are present in its cytoplasm forming the characteristic feature.
  • While dendrites are branched thread like structure arising from cyton which functions to receive impulses from sensory system and transfer it in form of electrical impulses to other neurons via the Axon.
So, the correct option is 'Perikaryon and Dendrites'.

Select the correct statement regarding the Schwann cells.

biology plant and animal tissues nervous system in animals structure of neuron structure and function of neuron

  1. Surround axon of myelinated nerve fibre

  2. Support muscle fibres

  3. Found in Haversian system of bones

  4. Form basement membrane of epithelium.

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Correct Option: A
Explanation:
Schwann cell, also called neurilemma cell, any of the cells in the peripheral nervous system that produce the myelin sheath around neuronal axons. Myelin, which is a fatty layer that insulates the axon, helps to increase the saltatory conduction of the neuron. 
So, the correct answer is option A.

The core component of central nervous system is 

biology life processes: control and coordination nervous system in animals structure of neuron structure and function of neuron

  1. Blood

  2. Neurons

  3. Ganglia

  4. Both A and B

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Correct Option: B
Explanation:
  • Neurons are the basic units of the nervous system. Every neuron is made of a cell body (also called a soma), dendrites and an axon. Dendrites and axons are nerve fibres.
  • The central nervous system consists of the brain and the spinal cord
  • The human brain contains around 100 billion neurons.
  • Hence the core component of the central nervous system is  Neuron.
  • So, the correct answer is 'Neurons'.

A minute gap across which impulse pass by neurotransmitter is called as a 

biology life processes: control and coordination nervous system in animals structure of neuron structure and function of neuron

  1. Cleft

  2. Synapse

  3. Nerve impulse

  4. None of the above

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Correct Option: B
Explanation:

The gap between two neurons across which impulses are conducted is known as a synapse. Synapse is a structure that permits a neuron to pass an electrical or chemical signal to another cell. It is important for neuronal function. 
Thus, the correct answer is option B.

Area of coming together of two neuron ends or between a dendron and axon ends is?

biology life processes: control and coordination nervous system in animals structure of neuron structure and function of neuron

  1. Junction

  2. Synapsis

  3. Synapses

  4. Synapticula

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Correct Option: C
Explanation:

  • In the nervous system, a synapse is a structure that permits a neuron (or nerve cell) to pass an electrical or chemical signal to another neuron or to the target effector cell. 
  • Synapses are stabilized in position by synaptic adhesion molecules (SAMs) projecting from both the pre- and post-synaptic neuron and sticking together where they overlap. Hence. Area of coming together of two neuron ends or between a dendron and axon ends is synapses.
So, the correct answer is 'synapses'.

A small gap that helps neurotransmitter to pass nerve impulse is called as

biology life processes: control and coordination nervous system in animals structure of neuron structure and function of neuron

  1. Neuron

  2. Synapse

  3. Ganglia

  4. None of the above

Show answer
Correct Option: B
Explanation:

The gap between two neurons across which impulses are conducted is known as a synapse. The presynaptic is the region of the axonic end of one neuron and the post synaptic is the dendritic end of the other neuron. It is a structure that permits a neuron to pass an electrical or chemical signal to another cell and acts as a communication point between the neuron and the target organ. The nerve impulses are transmitted and received with the help of this regions. 
Thus, the correct answer is option A.

The junction between two neurons is called as a synapse.
biology life processes: control and coordination nervous system in animals structure of neuron structure and function of neuron

  1. True

  2. False

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Correct Option: A
Explanation:
Synapse, also called neuronal junction, the site of transmission of electric nerve impulses between two nerve cells (neurons) or between a neuron and a gland or muscle cell (effector). A synaptic connection between a neuron and a muscle cell is called a neuromuscular junction.

So, the correct answer is 'True'.

In which region nerve impulses are transmitted and received? 

biology life processes: control and coordination nervous system in animals structure of neuron structure and function of neuron

  1. Nodes of Ranvier

  2. Dendrites

  3. Axon

  4. Synapse

Show answer
Correct Option: D
Explanation:

The gap between two neurons across which impulses are conducted is known as a synapse. The presynaptic is the region of the axonic end of one neuron and the post synaptic is the dendritic end of the other neuron. It is a structure that permits a neuron to pass an electrical or chemical signal to another cell. It is important for neuronal function. The nerve impulses are transmitted and received with the help of this regions. 
Thus, the correct answer is option D.

Which of the following statements explain the meaning of synapse.

biology life processes: control and coordination nervous system in animals structure of neuron structure and function of neuron

  1. Junction of two nerve cells.

  2. Junction of two muscle cells.

  3. Junction of two bone cells.

  4. Junction of two sperm cells.

Show answer
Correct Option: A
Explanation:

  • Synapse, also called neuronal junction, the site of transmission of electric nerve impulses between two nerve cells (neurons) or between a neuron and a gland or muscle cell (effector)
  • . A synaptic connection between a neuron and a muscle cell is called a neuromuscular junction. 

So, the correct answer is 'Junction of two nerve cells'.

What do will the microscope gap between a pair of adjacent neurons over which impulse passes?

biology life processes: control and coordination nervous system in animals structure of neuron structure and function of neuron

  1. Synapse

  2. Axon

  3. Dendrite

  4. Cell body

  5. None of these

Show answer
Correct Option: A
Explanation:

  • When a nerve impulse reaches the synapse at the end of a neuron, it cannot pass directly to the next one instead it triggers the neuron to release a chemical neurotransmitter. The neurotransmitter drifts across the gap between the two neurons.

So, the correct option is'Synapse'