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Neural Control and Coordination Test - 30

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Neural Control and Coordination Test - 30
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  • Question 1
    1 / -0
    Which is activated in stress condition?
  • Question 2
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    Which part of human brain is more develop in comparison of others? 
    Solution
    Cerebrum serves to receive sensory inputs, to bring about integration before commanding voluntary motor responses, to coordinate the activities of another part of the brain, and to carry out higher thought processes for learning, memory, language and speech. Cerebellum serves to coordinate the voluntary movements of skeletal muscles as well as posture, balance and equilibrium. Medulla oblongata consists of reflex centres that control heartbeat, blood vessel diameter and rhythm of breathing as well as other vital functions. Optic lobes serve to receive and interpret the sensory information about sight. Being superior in thinking, speech, memory and language from other animals, the human brain has more developed cerebrum as compared to those of others. This makes option A correct. Medulla, optic lobes and cerebellum perform the vital functions which are more or less common to all animals. Thus, the correct answer is A.
  • Question 3
    1 / -0
    The site from where the nerve impulse for hearing originates in mammals is
    Solution
    Sound waves enter the external auditory canal and cause the tympanic membrane to vibrate. Back and forth movement of tympanic membrane amplify the sound waves. 
    Ear ossicles are associated with amplification of sound waves as passing from inner surface of tympanic membrane through through oval window to basilar membrane. Vibrations of basilar membrane stimulate the hair cells (mechanoreceptors) of organ of corti to generate nerve impulse which is then carried to brain via auditory nerve. 
    Organ of corti is located in cochlear canal/cochlear duct/scala media and has hair cells on its basilar membrane. Vestibular apparatus consists of three semicircular canals, cristae and two sacs called as saccule and utricle. 
    Vestibule is the organ of sense of balance and is not associated with hearing. Therefore, the correct answer is option B.
  • Question 4
    1 / -0
    Nerves which carry messages from body parts to brain are called as
    Solution
    a) Motor nerves are the nerves which carries the information from the brain to the effector organs. For example, oculomotor nerve which carries motor impulse of muscles of the eye.
    b) Sensory nerves are the nerves which carries the stimulus from the organs to the brain for its interpretation. For example, Optic nerve is a second cranial nerve which originates from the retina of the eye and carries the stimulus to the occipital lobe of the cerebrum which interprets the information. 
    c) Saccral nerve are the nerves which arise from the saccral region of spinal chord. It forms plexus and supplies to lower portion of the body.
    So, the correct answer is option B.
  • Question 5
    1 / -0
    Largest part of the brain of man is called 
    Solution
    The cerebrum is the largest part in the human brain and consists of two cerebral hemispheres which in turn have four lobes; frontal lobe, parietal lobe, occipital lobe and temporal lobe. Corpus callosum is a bridge of white matter that connects two cerebral hemispheres. Olfactory lobes are the small bulb-shaped extension of the human brain and are connected with the limbic system. Optic nerve consists of ganglion cell fibres from the innermost layer of the retina and serves to transmit an impulse to the brain. Thus, the Correct answer is B. 
  • Question 6
    1 / -0
    Which of the following helps eye to adjust the focal length of the lens?
    Solution
    Ciliary body is a circular structure just behind the iris composed of the ciliary muscle and ciliary processes which attach to the lens. The ciliary processes secrete the aqueous fluid, and the ciliary muscle modifies focus by changing lens shape. Thus the correct answer is option C.
  • Question 7
    1 / -0
    A person going up to 10,000 feet high in a hot balloon may develop severe pain in the ear due to
    Solution
    The eustachian tube is a canal that connects the middle ear to the nasopharynx, It controls the pressure within the middle ear, making it equal to the air pressure outside the body. The pain is caused by unequal pressure that develops between the air in the middle ear and the air outside the ear.  Air pressure is highest nearer the ground. So as the balloon rises air pressure decreases. This pushes the eardrum outwards which is painful. 
    So, the correct answer is option A.
  • Question 8
    1 / -0
    Which part of the brain can distinguish the perfume smell? 
    Solution
    B- olfactory bulb found in base of fore brain process the smell signal received through sensory nerve.
  • Question 9
    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 10
    1 / -0
    The speed at which impulses are conducted increases with  
    Solution
    Dendrites are the small extension of nerve cells that receive signals from sensory receptors or other neurons. The nerve impulse is not conducted by them. 
    The long extension of the cell body of the nerve cell is called as axon that serves to conduct the nerve impulse away from the cell body. The increased diameter of axon results in reduced resistance to local current flow which in turn causes the action potential at its one site to activate the adjacent site. 
    Soma is the metabolic center of the nerve cell where the metabolic contents are manufactured. It is not involved in nerve impulse conduction. 
    Thus, the correct answer is option B.
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