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Neural Control and Coordination Test - 40

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Neural Control and Coordination Test - 40
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  • Question 1
    1 / -0
    Nissl's granules are made of ______________.
    Solution
    The correct option is A.
    Nissl's granules (or Nissl's bodies) are the groups of ribosomes and rough endoplasmic reticulum. These are actively involved in the synthesis of proteins.
  • Question 2
    1 / -0
    Nissl granules found in cyton of a neuron and having affinity for basic dyes are composed of _________.
    Solution
    The correct option is B
    A Nissl body, also known as Nissl substance and Nissl material, is a large granular body found in neurons. These granules are of rough endoplasmic reticulum (RER) with rosettes of free ribosomes, and are the site of protein synthesis. It contains RNA which are translated into proteins.
  • Question 3
    1 / -0
    Which is not part of nervous tissue?
    Solution
    Intermedin is also called a melanocyte-stimulating hormone. This hormone is not a part of the nervous system. Intermedin regulates skin pigmentation. On the other hand, Cyton and axon are the parts of a nerve cell (or neuron), and myelin is a fatty substance surrounding neurons. Hence all three cytons, axons, and myelin are the part of the nervous system & intermedin is not a part of nervous system.  The correct answer is D.
  • Question 4
    1 / -0
    Which of the following possesses nodes of Ranvier?
    Solution
    The correct option is A.
    The node of Ranvier is a periodic gap in the myelinated (insulating) sheat on the axon of certain neurons that serves to facilitate the rapid conduction of nerve impulses.
  • Question 5
    1 / -0
    Neuro-fibrils are present in ___________.
    Solution
    A. Cyton
    EXPLANATION: Neuro-fibrils are found in the cyton. Cyton is the main part of the neuron and consists of the nucleus and cytoplasm. It is also called as the cell body of neurons, which helps to carry impulses from dendrites to the axon.
  • Question 6
    1 / -0
    Nissl granules are absent in _________.
    Solution
    The correct option is B.
    A Nissl body is a large granular body found in neurons. These granules are rough endoplasmic reticulum (RER) with rosettes of free ribosomes and are the site of protein synthesis. An axon is the tubular process of the nerve cell, that carries impulses away from the cell body. Here, Nissl granules are absent.
  • Question 7
    1 / -0
    The area where myelin sheath is absent in the nerve fibre is:
    Solution

    The periodic gap in the insulating sheath (myelin) on the axon of certain neurons serves to facilitate the rapid conduction of nerve impulses is known as node Ranvier.
    So, the correct answer is 'Node of Ranvier'.

  • Question 8
    1 / -0
    In nerve cells, proteins are synthesised in ____________.
    Solution
    Answer is option (A) Cell Body.
    Nerve cell is also called Neuron. Every nerve cell is divided into 3 parts: Cell body, Axon, Dendrites.
    Protein synthesis occurs in specific structures called Nissl's granules present in the cell body of neurons.
    So, answer is option (A) Cell body.  

  • Question 9
    1 / -0
    Which part of the neuron is covered by a fatty sheath?
    Solution
    The Myelin Sheath of a neuron consists of fat-containing cells that insulate the axon from electrical activity. This insulation helps to increase the rate of transmission of signals. A gap exists between each myelin sheath cell along the axon called Node of Ranvier. 
    So, the correct option is A.

  • Question 10
    1 / -0
    The outer covering of non-myelinated neurons in brain is?
    Solution
    Unlike unmyelinated axons in peripharal nerves which are embedded in neurilemma of Schwann cells, the axons of central nerves do not have any covering. They are lined by the plasma membrane which is called Axolemma.
    Hence the correct option is B.
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