Tag: structure of neuron

Questions Related to structure of neuron

Nissl's granules are made of ______________.

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

  1. Ribosomes$/$RER

  2. SER

  3. DNA

  4. Golgi bodies

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Correct Option: A

Nissl granules occur in _____________.

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

  1. Bone cells

  2. Mast cells

  3. Nerve cells

  4. Chondrocytes

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Correct Option: C

Nodes of Ranvier occur in ____________.

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

  1. Cell body

  2. Right atrium

  3. Right ventricle

  4. Medullated nerve fibres

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Correct Option: D

Which pair of structures distinguishes a nerve cell from other cells?

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

  1. Vacuole and fibres

  2. Nucleus and mitochondria

  3. Perikaryon and dendrites

  4. Flagellum and medullary sheath

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Correct Option: C

Myelin sheath is formed from ______________.

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

  1. Nerve cells

  2. Glial cells

  3. Schwann cells

  4. None of the above

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Correct Option: C

Which part of neuron is covered by fatty sheath?

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

  1. Axon

  2. Cyton

  3. Dendrite

  4. Node of Ranvier

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Correct Option: A

The area where medullary sheath is absent in the nerve fibre is

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

  1. Nissl granules

  2. Schwann cells

  3. Node of Ranvier

  4. Schwann node

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Correct Option: C
Explanation:

The medullary sheath is composed of a shinning, white, fatty substance called myelin. This sheath perhaps serves as an insulating layer, preventing loss of energy of the nerve impulse during its passage along the fibre. The medullary sheath is continuous around the fibres in the central nervous system, but in the fibres of the peripheral nerves, it is absent at certain points known as the Node of Ranvier. The part of a nerve fibre between two successive nodes is termed the internode.

So, the correct answer is 'Node of Ranvier'.

Choose the odd pair.

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

  1. Areolar connective tissue - Collagen

  2. Epithelium - Keratin

  3. Muscle fibre - Actin

  4. Neuron - Melanin

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Correct Option: D

Non-excitable variously shaped cells found between neurons are ________________.

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

  1. Glial cells

  2. Schwann cells

  3. Dendrites

  4. Nissl bodies

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Correct Option: A
Explanation:

Answer is option A i.e. "Glial cells"
Glial cells- These cells are the helper cells in the central nervous system. They surround the neurons and provide insulation between two neurons. There are variously shaped like oligodendrocytes, astrocytes (star-shaped), ependymal etc.
Dendrites- They are branched extensions of nerve cells.
Nissl bodies- It is a large granular body found in the neuron cells.
Schwann cell- They are present in the axon of a neuron. They help in supporting nerve regeneration.
Thus the correct answer is "Glial cells"

On nerve fibres, to prevent leakage of an impulse, a layer of ...... is found.

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

  1. Rod cells

  2. Neurilemma

  3. Axons

  4. Myelin sheath

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Correct Option: D
Explanation:

Myelin is an insulating layer, or sheath, that forms around nerves. It is made up of protein and fatty substances. The fat helps to insulate the axons from electrically charged atoms and molecules. The purpose of the myelin sheath is to allow electrical impulses to transmit quickly and efficiently along the nerve cells.