In multiple sclerosis the myelin sheaths around the axons of the brain and spinal cord are damaged and demyelination results
How does this disease manifest at the level of the action potential? I) Action potentials move in the opposite direction on the axon. II) Action potentials move more slowly along the axon. III) No action potentials are transmitted. A) only I
B) only II
C) only III
D) only II and III
B
You might also like to view...
All of the following describe characteristics of sclerenchyma cells, except which?
A. Their function is primarily to transport oxygen and carbon dioxide throughout the leaf. B. They have thick, tough secondary walls. C. Their secondary walls may be impregnated with lignin. D. They form fibers and sclereids. E. They lack living protoplasts when mature.
Cells become progressively committed to specific patterns of gene activity and developmental fate
through a process known as: a. morphogenesis. b. determination. c. cell differentiation. d. nonspecific differentiation. e. growth.
Which of the following is not characteristic of primates?
a. stereoscopic vision b. grasping hands c. large brain size d. freely rotating limbs e. claws at the tips of digits
________ reasoning involves gathering facts that lead toward a logical generalized statement or conclusion
Fill in the blank(s) with correct word