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Neural Control and Coordination Test - 19

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Neural Control and Coordination Test - 19
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  • Question 1
    1 / -0
    The kind of tissue that forms the supportive structure in our pinna (external ears) is also found in
    Solution
    Pinna is provided with voluntary muscle and is supported by elastic fibrocartilage. Nose cartilage includes the lateral nasal cartilages, the lesser alar cartilages, the greater alar cartilages, and the septal cartilage.
    So, the correct answer is option D.
  • Question 2
    1 / -0
    Adaptation of eyes in dark is due to
    Solution
    C. Repletion of vision pigment in rods
    Reason:Adaption by eyes means to the ability of the eye to adjust with the amount of light. There are three most important factor regarding the vision adaptation in dark. Those are the pupil, the cone cells, and the rod cells. The pupil allows the light into the eye, cone cells along the retina are responsible for color vision and the rod cells are responsible for black and white vision. Both Cones and rods contain rhodopsin, a common biological pigment that is a highly sensitive photoreceptor. The pigment get dissociated into retinal and opsin in presence of light. Rods are more sensitive to light and take longer to fully adapt to the change in light. Besides, the photopigment in the rods regenerate more slowly, thus do not reach their maximum sensitivity while cone cells take just 10 minutes. However, since there are far more rods in the retina than cone cells it is the repletion of visual pigment in rods that help in the adaptation of eyes to dark. So the correct option is C.
  • Question 3
    1 / -0
    The opening at the base of the skull for the spinal cord is called


    Solution
    The cranial cavity in which the brain is lodged posteriorly opens by foramen magnum. The brain is connected to spinal cord at this foramen.
  • Question 4
    1 / -0
    In a neuron, conversion of electrical signal to a chemical signal occurs at
    Solution
    Signals are transferred from one neuron to another. The electrical signals are very fast as compared to that of chemical signals. Myelinated sheath present on the surface of neurons helps in better conduction of signals. At the end of the axon (axonal end), the electrical signal is converted into a chemical signal, and the axon releases chemical messengers called neurotransmitters (acetylcholine) which are received by their receptors on the dendrites of the subsequent neuron. This region is called synapse.
    So, the correct answer is 'Axonal end'
  • Question 5
    1 / -0
    Which of the following statement is/are correct about receptors?
    Solution
    The sensory structures for taste are called as taste buds which act as gustatory receptors. A single taste bud contains 50 to 75 slender taste receptor cells, all arranged in a banana like cluster pointed towards the gustatory pore. 
    Olfactory receptor plays a central role in the sense of smell. Olfactory receptor cells which are present in very large numbers (millions) and are clusters within a small area in the back of the nasal cavity, forms an olfactory epithelium.
    Hearing is attributed to auditory receptors.
    Therefore, the correct answer is option A. 
  • Question 6
    1 / -0
    Which is the correct combination about the figure?

    Solution
    • Dendrites receive impulses. It is represented by (a).
    • The cell body or cyton contains the nucleus and cell organelles. It is represented by (b).
    • Axon (It is represented by (c)) is an elongated dendron that transfers the impulse to another nerve through a knob-like structure which is known as a synaptic knob that contains neurotransmitters (chemical transmission of signal). It is represented by (d).
    So, the correct answer is option B.
  • Question 7
    1 / -0
    Statements (A, B, C, D) in List I have to be matched with statements (p, q, r, s) in List II.
    List IList II
    ACytonp The body of the nerve cell that contains the organelles.
    BDendriteqReceives the stimuli sent from another nerve or the outside environment.
    CAxonrA fatty substance that covers the axon of the nerve cell and speeds.
    DMyelin sheathsThe long, thin section of the nerve cell where the impulse is transmitted across.
    Solution
    Cyton is the cell body of the neuron. It contains the nucleus.
    Dendrites are the cellular extension from the cyton. They receive stimulus, which may be physical, chemical, mechanical or electrical, and passes it on to the cyton.
    Axons are also known as nerve fibres which are a projection of a nerve cell, or neuron, that typically conducts electrical impulses away from the neuron's cell body.
    Myelin sheath is also known as the medullary sheath. It is the envelope of myelin that surrounds the core of a nerve fiber or axon and that facilitates the transmission of nerve impulses, formed from the cell membrane of the Schwann cell in the peripheral nervous system and from oligodendroglia cells. 
    So, the correct answer is option C.
  • Question 8
    1 / -0
    Which of the following is the seat of intelligence and control voluntary actions in the brain?
    Solution
    Cerebrum is the largest part of the brain. It performs various functions such as receiving sensory inputs, integration before commanding voluntary motor responses,  coordinate the activities of other parts of the brain, and to carry out higher thought processes for learning, intelligence memory, language and speech. Thus the correct answer is option C.
  • Question 9
    1 / -0
    Malleus is a part of
    Solution
    The malleus or hammer is a hammer- shaped small bone or ossicle of the middle ear which connects with the incus and is attached to the inner surface of the eardrum. It transmit the sound vibrations from the eardrum to the incus in rabits.
    So, option C is the correct option.
  • Question 10
    1 / -0
    Spinal cord originates from ___________.
    Solution
    • The spinal cord is an important part of the central nervous system that originates from the medulla. 
    • The spinal cord is 40 cm to 50 cm long and 1 cm to 1.5 cm in diameter. 
    • The major function of the spinal cord is the transmission of neural signals between the brain and the rest of the body.
    So, the correct answer is 'Medulla'.

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