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Neural Control and Coordination Test - 28

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Neural Control and Coordination Test - 28
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  • Question 1
    1 / -0
    Constriction of the pupil is function of
    Solution
    Constriction of the pupil is the function of the parasympathetic system. The parasympathetic nervous system is one of the two divisions of the autonomic nervous system, the other is the sympathetic nervous system. The autonomic nervous system is responsible for regulating the body's unconscious actions. The parasympathetic system is responsible for stimulation of "rest and digest" or "feed and breed" activities that occur when the body is at rest, especially after eating, including sexual arousal, salivation, lacrimation (tears), urination, digestion and defecation. 
  • Question 2
    1 / -0
    Memory is related to
    Solution
    The cerebrum is around most of the structures of the brain and contains billions of neurons that control everything that a person does, thinks and senses. As the most well-developed part of the brain, the cerebrum is what most people think of when they think of the brain. The cerebrum controls language, senses, memory, thinking and personality.
  • Question 3
    1 / -0
    Which cell organelle is absent in neuron?
    Solution
    A centriole is a small set of microtubules arranged in a specific way. There are nine groups of microtubules. When two centrioles are found next to each other, they are usually at right angles. The centrioles are found in pairs and move towards the poles (opposite ends) of the nucleus when it is time for cell division. Neurons cannot divide because they lack centrioles.
    Because centrioles function in cell division, the fact that neurons lack these organelles is consistent with the amitotic nature of the cell.
    Therefore, the correct answer is option C.
  • Question 4
    1 / -0
    Which cells form no layers and remain separate?
    Solution
    • Nerve cells or neurons are the longest cells of the body. They form the structural and functional unit of the nervous system. 

    • Nerve cells do not form layers and are structurally separated from one another, but can communicate through the synapse.

    • Epithelial cells, muscle cells, and gland cells are arranged in layers.

    So, the correct answer is option 'C'.

  • Question 5
    1 / -0
    The longest cell in human body is_______________
    Solution
    The average length of muscle fibers is of a few centimeters. 
    The average size of epithelial cells is of few microns. 
    Nerve cells possess a cell body and one to many thin, fiber-like axons.
    Some nerve cells possess axons as long as 1 meter. Therefore, option A is correct. 

  • Question 6
    1 / -0
    The olfactory receptors in human body are found in 
    Solution
    Olfactory receptors are found in nose. They are associated with the perception of smell. Olfactory receptors expressed in the cell membranes of olfactory receptor neurons are responsible for the detection of odor molecules. Activated olfactory receptors are the initial player in a signal transduction cascade which ultimately produces a nerve impulse which is transmitted to the brain.
    Therefore, the correct answer is option B.
  • Question 7
    1 / -0
    Nerve cells have many short branches called as___________
    Solution
    Dendrite is a short branched extension of a nerve cell, along which impulses received from other cells at synapses are transmitted to the cell body. 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. An axon is a long, slender projection of a nerve cell, or neuron, that typically conducts electrical impulses away from the neuron's cell body. Myelinated axons are known as nerve fibers. The function of the axon is to transmit information to different neurons, muscles and glands. A neutrophil is a type of white blood cell, a type of granulocyte, and a type of phagocyte. 
    Therefore, the correct answer is option A.
  • Question 8
    1 / -0
    What is the function of nerve cells?
    Solution
    Nerve cells carry out different functions such as receiving the message from within or outside of the body, transferring the messages from body part to the brain, and carrying the signal from the brain to different parts of the body. Thus, nerve cell helps the brain in control and coordination of the body.
    Therefore, option D is correct. 
  • Question 9
    1 / -0
    In mammals, the autonomic system is composed of
    Solution
    The nervous system is divided into two major divisions, central and peripheral nervous system. 
    The centrally located central nervous system includes brain and spinal cord. Peripheral nervous system includes all cranial and spinal nerves. 
    Peripheral nervous system is further divided into somatic and autonomous divisions. The autonomous nervous system has two divisions; sympathetic and parasympathetic divisions, which have opposite functions. 
    The nerve fibres are classified as myelinated and non myelinated fibres on the basis of presence or absence of myelin sheath. Myelinated fibres are present in the white matter of brain and spinal cord as well as in cranial and spinal nerves. Non-myelinated fibres are present in autonomous nerves system. 
  • Question 10
    1 / -0
    The longest cell in the body of an animal is
    Solution
    The longest cells in the human body are the neurons. Neurons are the cells of the nervous system. These cells are responsible to carry the impulse and responses. The axonic end of the neuron is present in the skin and extends into the CNS (brain and spinal cord).
    Therefore, the correct answer is option B.
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