Multiple sclerosis (MS) is a progressive inflammatory disease of the central nervous system characterized by intermittent damage to myelin (called demyelination) caused by the destruction of specialized cells (oligodendrocytes) that form the substance. Given what you know about the function of myelin, predict the consequences associated with its progressive loss.
_____ Sensory abnormalities (e.g., tingling, numbness, itching, tightness, burning, shooting pain) and motor coordination loss.
_____ Racing heartbeat, hyperactivity and nausea.
_____ Low levels of potassium in the blood (hypokalemia).
_____ Balance and equilibrium abnormalities (e.g., dizziness, vertigo, uncoordinated movements, tremor).
__X__ Sensory abnormalities (e.g., tingling, numbness, itching, tightness, burning, shooting pain) and motor coordination loss.
_____ Racing heartbeat, hyperactivity and nausea.
_____ Low levels of potassium in the blood (hypokalemia).
__X__ Balance and equilibrium abnormalities (e.g., dizziness, vertigo, uncoordinated movements, tremor).
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Very few preventative measures are taken against anthrax, because
A) the general population is not exposed to infected materials or animals regularly. B) non-weaponized anthrax causes only a mild flu-like illness. C) no vaccines are effective. D) the causative agent Bacillus anthracis mutates rapidly.
Which of the following statement best describes the defining characteristics of members of the Class Testudines?
A. They lack teeth. B. They have a hard shell. C. They have a kinetic skull. D. They have both a hard shell and are lacking in teeth. E. They have both a kinetic skull and a hard shell.
Source of cells that differentiate into primary vascular tissues.
Choose the letter of the best match: A. protoderm B. vascular cambium C. apical meristem D. procambium E. ground meristem
In the above illustration of fluid regulation in a planarian, the letter "A" represents which of the following?
a. nucleus of the flame cell b. small capillaries that allow water to freely diffuse into the planarian c. sexual reproductive organ d. cilia to draw fluid into the planarian e. funnel to collect fluid