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Structural Organisation in Animals Test - 38

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Structural Organisation in Animals Test - 38
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  • Question 1
    1 / -0
    The longest cell in the animal body is a/an
    Solution
    The longest cells in the human body are neurons. Neurons are cells within the nervous system and carry messages throughout the body. Although they range in size, some neurons are 3 feet long. These include the neurons that go from the skin into the spinal cord and up into the brain stem. Their impressive length makes neurons the longest cells in the body. 
    Therefore, the correct answer is option B.
  • Question 2
    1 / -0
    Nodes of Ranvier are 
    Solution
    Node of Ranvier are the periodic gaps present in the form of narrow areas in the insulating myelin sheath on the axon of a neuron. At the nodes of Ranvier the cell membrane is exposed i.e is non-myelinated. It has channel proteins that allow ions to enter and exit the cell bringing about the rapid conduction of nerve impulses. Thus the correct answer is option D.

  • Question 3
    1 / -0
    The tissue that covers the external and internal surfaces of animal body is:
    Solution

    The external surfaces and internal linings of the animal body are made up of various kinds of epithelial tissues. Epithelial tissues have various functions all across our bodies like secretion, absorption, protection, sensing and, to some extent, thermoregulation. So, the correct answer is 'Epithelial'.

  • Question 4
    1 / -0
    The epithelium of the alveoli of lung is____________.
    Solution
      • Simple squamous epithelium lines the air sacs, or alveoli, of the lungs.
      • Simple squamous epithelial cells in the alveoli allow the exchange of gases in the lungs.
      • Striated, columnar and cuboidal epithelium is absent in the lines of alveoli. 
      Hence, the correct answer is option 'C'.
      • Question 5
        1 / -0
        Cuticle of earthworm is secreted by which of the following layers of the body?
        Solution
        It is assumed that several proteins produced by the epidermal cells of Pheretima produce the cuticle and the epidermal cells also regulate the timing and amount of the proteins that are to be incorporated into the cuticle.
        So, the correct answer is 'Epidermis'.
      • Question 6
        1 / -0
        Area of coming together of two neuron ends in between a dendrite and axon end is known as
        Solution
        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. Synapsis is the fusion of chromosome pairs at the start of meiosis. A cell junction (or intercellular bridge) is a type of structure that exists within the tissue of some multicellular organisms, such as animals. Cell junctions consist of multiprotein complexes that provide contact between neighbouring cells or between a cell and the extracellular matrix. Synapticula is one of the numerous calcareous processes which extend between, and unite, the adjacent septa of certain corals.
        Therefore, the correct answer is option A.
      • Question 7
        1 / -0
        A nerve cell transmits it's impulse to another through its_______________
        Solution
        • The axon terminals are the end of axon fiber and located close to the dendrites of another neuron, forming a connection known as a synapse and allowing them to send messages from neuron to neuron with the help of neurotransmitter. 
        • So, a nerve cell transmits it's impulse to another through its axons. 

        Thus, option C is correct and other options are wrong.
      • Question 8
        1 / -0
        The neurotransmitter substance found between a motor neuron and a muscle cell is
        Solution
        The neurotransmitter substance found between a motor neuron and a muscle cell is acetylcholine. In the autonomic nervous system, acetylcholine (ACh) is the neurotransmitter in the preganglionic sympathetic and parasympathetic neurons. ACh is also the neurotransmitter at the adrenal medulla and serves as the neurotransmitter at all the parasympathetic innervated organs. ACh is also the neurotransmitter at the sweat glands, and at the piloerector muscle of the sympathetic ANS. 
        Therefore, the correct answer is option D.
      • Question 9
        1 / -0
        Which of the following tissues in mammals show the least capacity for regeneration?
        Solution
        Nervous tissues of the brain show the least capacity for regeneration, because of various roadblocks present in the diseased or injured CNS that hinders the pathways for the regeneration of neurons in the brain.
        So, the correct answer is 'Nervous tissue of brain'.
      • Question 10
        1 / -0
        The cells which pass the instructions from brain to different parts of the body are called as
        Solution
        A neuron is an electrically excitable cell that processes and transmits information through electrical and chemical signals. These signals between neurons occur via synapses, specialized connections with other cells. Neurons can connect to each other to form neural networks. Neurons are the core components of the brain and spinal cord of the central nervous system (CNS), and of the ganglia of the peripheral nervous system (PNS). 
        Therefore, the correct answer is option B.
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