Graves disease, the most common form of hyperthyroidism, is caused by
A. an excess of iodine.
B. an improper diet.
C. an autoimmune disorder.
D. a lack of iodine.
Answer: C
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Under certain conditions, the vocal folds act as a sphincter that prevents air passage
Indicate whether the statement is true or false
Slow-twitch fibers are specialized to continue contracting for extended periods of time without experiencing fatigue.
Answer the following statement true (T) or false (F)
Where is the cerebral cortex concerned with hearing located?
A. Frontal lobe B. Precentral gyrus C. Parietal lobe D. Temporal lobe E. Occipital lobe
Differentiate graded potentials and action potentials. Select all that apply.
-summation of graded potentials can not occur but summation of action potentials are possible. -graded potentials are conducted in a decremental fashion and action potentials are conducted with a constant magnitude -the magnitude of graded potentials is variable and action potentials are all or none.