Bio 240 Human Ana & Phys I Laboratory Examinations S& fi Instructor Dr P. Alanau
ID: 303128 • Letter: B
Question
Bio 240 Human Ana & Phys I Laboratory Examinations S& fi Instructor Dr P. Alanaums a. Summation of impulses seceived by the soma & sends response down the ason b. Spatial summation only receptice of impulses from the asons d a and b only e. none of the above a. Soma or cell'body is located in the anterior prey matter of the spinal cord b. Associsted with sensory or afferetpatway. C.cell hody located in dersal root ganglion d a and b only e.b and e only 22) Which of the following is true of myelin sheath. a. It is a lipid or Eaty substance e. In the CNS, is formed by schwann cellsd has nodes of ramvier e. a and d only h. in the PNS is foemed by oligodendrocytes 23) Which of the following is not true A non-myelinated neurons conduct impulses faster than myelinuned nes B myelinanted neurcas are associated with salutatory condaction of impalses c, Aso asonic & Axo-soutic sprtapses does not exist, only ave detidmic ,vaapses des exist d a and b only e a and e only 24) Which of the Sollowing is true about neurilemma a It is the outermost lover of the myelin sheath thar hasa cleus &eytoplasm; in oligodendrocytes b. Ie is the outermost layer of the myelin shesth tht h a ocleus & cytoplasm in scha e. It heips in repair of minimally damaged nerves, in the periphenl nervous system cells d. A and c only E. b and e only 25) Where would you c omecely find bipolar neurens .. ?s he pinal ned e a and b only b. miluciei oa the brain ein special enie murs d' a and c only 26) Action Potential is associated with ?rapid in nue orNa-ions into the cy?oplam of a stimulated neuron b. rapid intlas of K+ lons ino the cytuplasm of a stimulated neuron c the transmission of the depolarization wave along the neveunal nembone d. A and c only e. None of the above 27) A reflex are consists of a Afferent neuron b. efferent neurce .interneuron d all of the above e a and b only 28) Which of the following is trus a. Endoneurium sumounds cach nerve fiber b erineurium surmounds nerve fiher bundles called fascicle e perineurium surrourds a group of nerve filbers forming a fascicle d The connective tissun wrappings found in a nerve helps with nerve insulatioe e All of the above 29) The brain is made up of a 2 cerebri e the heainstemExplanation / Answer
Answer 21
B & C only
The cells of the dorsal root ganglion are unipolar cells, Sensory neurons (afferent neurons) are unipolar
Answer 22
A & D only
Because it is a lipid-rich substance formed in the central nervous system & there are unmyelinated gaps between myelin sheaths These gaps are called nodes of Ranvier.
Answer 23
A & c
Because myelinated neurons conduct impulse faster than non myelinated due to larger diameter , axo-axonic synapses exist
Answer 24
It is the outermost layer of the myelin sheath that has a nucleus and cytoplasm in Schwann cells
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