Which of the following is a medical disorder in which the myelin in the CNS has been destroyed?
A. Multiple sclerosis
B. Meningitis
C. Guillain-Barré syndrome
D. Myasthenia gravis
Answer: A
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Lower motor neurons are always excitatory
Indicate whether this statement is true or false.
Internal work
a. includes all of the energy-expending activities that must go on all of the time to sustain life. b. refers to all energy expenditure by tissues other than skeletal muscles. c. includes the energy expenditure required to move external objects. d. both (a) and (b) above. e. all of these answers.
The Haldane effect means that
A. as hemoglobin releases O2, the ability to pick up CO2 decreases. B. as hemoglobin releases O2, the ability to pick up CO2 increases. C. as hemoglobin releases bicarbonate ions, the ability to pick up chloride ions increases. D. as hemoglobin releases CO2, the ability to pick up O2 increases.
How could you best improve the contrast of this specimen?
A. Rotate the nosepiece to a higher objective. B. Rotate the fine adjustment knob. C. Rotate the condenser knob. D. Open or close the iris diaphragm.