Tag: structure of neuron

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

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

  1. Flagellum and medullary sheath

  2. Nucleus and mitochondria

  3. Perikaryon and dendrites

  4. Vacuoles and fibres
Reveal answer Fill a bubble to check yourself
C Correct answer
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'.
Multiple choice biology plant and animal tissues nervous system in animals structure of neuron structure and function of neuron

Select the correct statement regarding the Schwann cells.

  1. Surround axon of myelinated nerve fibre

  2. Support muscle fibres

  3. Found in Haversian system of bones

  4. Form basement membrane of epithelium.
Reveal answer Fill a bubble to check yourself
A Correct answer
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.
Multiple choice biology life processes: control and coordination nervous system in animals structure of neuron structure and function of neuron

The core component of central nervous system is 

  1. Blood

  2. Neurons

  3. Ganglia

  4. Both A and B
Reveal answer Fill a bubble to check yourself
B Correct answer
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'.
Multiple choice biology life processes: control and coordination nervous system in animals structure of neuron structure and function of neuron

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

  1. Cleft

  2. Synapse

  3. Nerve impulse

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

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

  1. Junction

  2. Synapsis

  3. Synapses

  4. Synapticula
Reveal answer Fill a bubble to check yourself
C Correct answer
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'.

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

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

  1. Neuron

  2. Synapse

  3. Ganglia

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
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'.
Multiple choice biology life processes: control and coordination nervous system in animals structure of neuron structure and function of neuron

In which region nerve impulses are transmitted and received? 

  1. Nodes of Ranvier

  2. Dendrites

  3. Axon

  4. Synapse
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

Which of the following statements explain the meaning of synapse.

  1. Junction of two nerve cells.

  2. Junction of two muscle cells.

  3. Junction of two bone cells.

  4. Junction of two sperm cells.
Reveal answer Fill a bubble to check yourself
A Correct answer
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'.

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

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

  1. Synapse

  2. Axon

  3. Dendrite

  4. Cell body

  5. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
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'