Slide 1 : THIS UNIT WILL COVER :
NERVOUS SYSTEM ACC TO LATEST NCERT SYALLABUS FOR BOARD & COMPETATIVE EXAMS. NERVOUS SYSTEM
(control & coordination)
Slide 2 : The nervous system, in coordination with endocrine system communicates, integrates & coordinates various organs and organ system in the body.
-> Nervous system resembles a complicated tangle of wires in a large telephone cable which enables us to communicate with world, we tend to take granted our nervous system which is more complex than the man made cable system.
-> Headed by the brain our nervous system links masses of chaotic individuals cell into well coordinated system in which every part of body functions in a manner that is conducive to survival and well being of the organism.
-> Contraction of hand muscles on touching hot object protect body from harm, speed of reaction is measure of alertness of nervous system, it is the brain that gives us the feeling of joy or appreciation. The most remarkable feature of nervous system is it's ability to respond simultaneously to several stimuli. example: we eat and read at some time, knit while watching T-V., singing while playing paino.
-> Every set of coordinated manner whether skilled performances or routine tasks eg: cycling or driving car involve integrating power's of nervous system.
Slide 3 : IN WHICH OF THE FOLLOWING THE SPEED OF CONDUCTION IS FASTEST?
(1) A (2) B (3) C (4) A,B
NOTE:DIAMETER AND LENGTH OF A,B,C ARE SAME SOME IMPORTANT MCQS ON NERVOUS SYSTEM-INTRO ANSWER: 3
Slide 4 : THE FOLLOWING STATEMENTS CONCERNING CYTOLOGY OF NEURON ARE CORRECT EXCEPT ?
(A) A UNIPOLAR NEURON IS ONE THAT GIVES RISE TO A SINGLE NEURITE THAT REMAINS UNBRANCHED UNTIL IT REACHES ITS DESTINATION AND SYNAPSES WITH A SECOND NEURON.
(B) A BIPOLAR NEURON IS ONE THAT GIVES RISE TO A NEURITE THAT EMERGES FROM EACH END OF THE CELL BODY .THE SENSORY GANGLIA OF VESTIBULUOCOCHLEAR NERVE POSSESS BIPOLAR NEURONS.
(C) NISSL SUBSTANCE IS NOT FOUND IN THE AXON OF NEURON.
(D)THE GOLGI COMPLEX IS IMPORTANT IN SYNTHESIS OF CELL MEMBRANES.
(E)MELANIN GRANULES ARE FOUND IN THE NEURONS OF SUSTANTIA NIGRA AND IT IS THESE NEURONS THAT ARE RESPONSIBLE FOR NEUROTRANSMITTER DOPAMINE. ANSWER : A
Slide 5 : THE FOLLOWING STATEMENTS CONCERNING DENDRITE ARE TRUE EXCEPT ?
A DENDRITE ALWAYS CONVEYS A NERVE IMPULSE TOWARDS A NERVE CELL BODY.
DENDRITIC SPINES ARE SMALL PROJECTIONS OF THE PLASMA MEMBRANE THAT INCREASE RECEPTOR SURFACE ARES OF DENDRITE.
CYTOPLASM OF DENDRITE HAS NISSLS GRANULES,MICROTUBLES,RIBOSOME,AGRANULAR ENDOPLASMIC RETICULUM.
MOST DENDRITES INCREASE IN WIDTH AS THEY EXTEND FROM NERVE CELL BODY.
DENDRITES OFTEN BRANCH PROFUSELY ANSWER:D
Slide 6 : AN 8 YEAR OLD BOY AND A 12 YEAR OLD GIRL WERE TAKING A WALK IN THE COUNTRY WHEN A SICK LOOKING RACOON CROSSED THEIR PATH THEY ATTEMPTED TO STOKE THE ANIMAL WHICH PROMPTLY BIT THEM.THE BOY WAS BITTEN ON THE LEG AND THE GIRL ON THE CHEEK.LATER IT WAS FOUND THAT THE ANIMAL WAS RABID.
WHICH OF THE STATEMENTS IS NOT TRUE?
A) rabies virus is present in saliva of infected animal
B) virus eventually spreads to CNS
C) incubation period for rabies in girl is more than that in boy
D) the virus reaches the CNS by traveling along peripheral nerves ANSWER:C
Slide 7 : THE SCHWANN SHEATH IS :
A) NON MYELINATED NERVE FIBRE
B) ASSOCIATED WITH MYELIN SHEATH
C) A CONNECTIVE TISSUE CELL
D) ASSOCIATED WITH MYELINATED
AND NON MYELINATED NERVE FIBER ANSWER:D
Slide 8 : FOR MORE QUESTIONS AND CLASS ON INTRO TO NERVOUS SYSTEM LOG ON TO: http://www.wiziq.com/sanjeev-kukreti1687100
timings for free class: Sunday, October 23, 2011 10:00 PM (IST)