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Neural Control and Coordination Test - 24

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Neural Control and Coordination Test - 24
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  • Question 1
    1 / -0
    Minimum regeneration power is present in, which of the following tissue?
    Solution
    The minimum power of regeneration is found in nervous tissues. Sometimes, it is also considered that power of regeneration is absent in nervous tissues. There is no cell division observed after maturity in nervous tissues.
    So, the correct answer is option A.
  • Question 2
    1 / -0
    What used to be described as Nissl granules in a nerve cell are now identified as?
    Solution
    A Nissl granule 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.
    Hence the correct option is C.
  • Question 3
    1 / -0
    Histiocyte of brain is a
    Solution
    Microglia is referred to as the histiocytes of the central nervous system. It constitutes 10–15% of all cells found in the brain. These long-lived cells undergo very little turnover in normal physiological states. Microglia helps to sense various types of danger and differentially react with a classical or alternative reparative response. Hence, option B is correct.
  • Question 4
    1 / -0
    Nissl granules are found in 
    Solution
    A Nissl body is also known as Nissl or tigroid substance. It is a large granular body found in neurons. These granules are formed of rough endoplasmic reticulum (RER) with rosettes of free ribosomes and are the sites of protein synthesis.
    Hence the correct option is B.
  • Question 5
    1 / -0
    The gray matter consists of
    Solution
    Cerebrum is the largest part of the brain which helps in the interpretation of the stimulus and generates nerve response. The outer portion of the cerebrum appears grey so it is known as grey matter. It appears grey because it has large number of neuronal cell bodies and unmyelinated axon. The inner portion of the brain is known as white matter as it consist of very less neuron cell bodies and myelin sheath.
    So, the correct answer is option C.
  • Question 6
    1 / -0
    The cavities of brain are lined by:
    Solution
    Ependymal cells are the cube-shaped epithelial cells that forms the epithelial lining of the cavities in brain and central canal of spinal cord. 
    These cells are formed from a layer of embryonic tissue known as neuroectoderm and secrete cerebrospinal fluid for mechanical protection.
    Thus, the correct answer is option C.
  • Question 7
    1 / -0
    'Nodes of Ranvier' are found in 
    Solution
    Nodes of Ranvier are periodic gaps in the insulating sheath (myelin) on the axon of certain neurons, that serves to facilitate the rapid conduction of nerve impulses. 
    The action potential propagated by one node of Ranvier jumps to and is regenerated at the next node along the axon, thereby enabling the action potential to travel rapidly along the fiber. This mode of conduction of impulses is called saltatory conduction.
    Hence the correct option is C.
  • Question 8
    1 / -0
    The Nissl granules of nerve cells are made up of 
    Solution
    A Nissl granule 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.
    Hence the correct option is A.
  • Question 9
    1 / -0
    Myelin sheath is present over:
    Solution
    Schwann cells also called as neurolemmocytes are the principal glia of the peripheral nervous system (PNS). 
    Myelinating Schwann cells wrap around axons of motor and sensory neurons to form the myelin sheath. 
    Hence, the correct answer is option B.
  • Question 10
    1 / -0
    Pigmented epithelium is found in
    Solution
    The retinal pigment epithelium (RPE) is the pigmented cell layer, located just outside the retina and is attached to choroid, a layer filled with blood vessels that nourish the retina. The RPE closely interacts with photoreceptors and thereby maintenance of visual function. It is composed of a single layer of hexagonal cells, which are densely packed with granules of melanin that absorbs the light energy that arrive to the retina.
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