Tag: structure of neuron

Questions Related to structure of neuron

Some cell in our body can be over a feet long. They are

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

  1. Muscle cells

  2. Bone cells

  3. Nerve cells

  4. Gland cells

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Correct Option: C
Explanation:

Certain neurons or nerve cells may almost equal the length of body itself. The axon of a motor neuron in the spinal cord, that innervates a muscle in the foot can be about 1 meter (3 feet) in length.

Which one is absent in neurons ?

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

  1. Neurilemma

  2. Axon

  3. Sareolemma

  4. Dendrites

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Correct Option: C

The charge on the outer side of neuron is

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

  1. +ve

  2. -ve

  3. Zero

  4. Alternate -ve and +ve

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Correct Option: A

In axon of a neuron, the impulse is generated by exchange of

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

  1. Sodium and chlorine

  2. Magnesium and chlorine

  3. Calcium and potassium

  4. Sodium and potassium

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Correct Option: D

Touch on the right side stimulate neurons on

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

  1. Right somatic sensory area

  2. Right somatic motor area

  3. Left somatic sensory area

  4. Both B and C

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Correct Option: C

Myelin sheath is derived from

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

  1. Neuroglial cells

  2. Schwann cells

  3. Nerve cells

  4. All of these

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Correct Option: B
Explanation:

  • Myelin sheath is formed by oligodendrocytes in the CNS and by Schwann cells in the peripheral nervous system. 
  • These cells wrap layer upon layer of their own plasma membrane in a tight spiral around axon. 
  • The insulating layer checks the leakage of charge and lesser stoppage points (nodes of Ranvier) leading to acceleration of the conduction and conservation of the metabolic energy.
So, the correct option is 'Schwann cells'.

End plate junction is present between

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

  1. Neuron and striated muscle

  2. Neuron and neuron

  3. Muscle and muscle

  4. Both (b) and (c)

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Correct Option: A
Explanation:
  • The site of chemical communication between a nerve fibre and a muscle cell is called the end plate junction or neuromuscular junction.
  • The neuromuscular junction is analogous to the synapse between two neurons. 
  • A nerve fibre divides into many terminal branches; each terminal ends on a region of muscle fibre called the end plate. Embedded in the end plate are thousands of receptors. 
  • So, the correct option is 'Neuron and Striated muscle'.

The myelin sheath around the axon is produced by which type of neurogical cells?

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

  1. Satellite glial cells

  2. Radial glial cells

  3. Dendrocytes

  4. Schwann cells

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Correct Option: D
Explanation:


  1. Myelin sheath is formed by oligodendrocytes in the central nervous system and by Schwann cells in the peripheral nervous system. 
  2. These cells wrap layer upon layer of their own plasma membrane in a tight spiral around axon. 
  3. The insulating layer checks the leakage of charge and lesser stoppage points (nodes of Ranvier) leading to acceleration of the conduction and conservation of the metabolic energy.
So, the correct option is 'Schwann cells'.

During depolarisation of neuron

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

  1. $K^+$ channels remain open

  2. N$a^+$ gets inside through ion channels

  3. N$a^+$ gets outside through ion channels

  4. All the above

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Correct Option: B

An investigator places an isolated neuron in a calcium-free medium, gives the neuron a suprathreshold stimulus and then performs an assay to test whether neurotransmitter is released into the medium. Which of the following outcomes would you predict?

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

  1. No neurotransmitter is detected since influx of calcium into the synaptic knob is required for neurotransmitter release.

  2. No neurotransmitter is detected since influx of calcium is required in order for the neuron to conduct an action potential.

  3. Neurotransmitter is detected since calcium is not required for action potential conduction and the initial stimulus was suprathreshold.

  4. We cannot predict the outcome without knowing whether the neuron was myelinated or non-myelinated.

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Correct Option: A