The waves on an electrocardiograph represent

a. time.
b. amplitude or voltage.
c. amount of blood flow.
d. size of the heart.

b

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The lungs are covered by:

a. the visceral pleura. c. the parietal pleura. b. the parenchyma. d. none of the above.

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Personnel make up 60% of all healthcare professionals

Fill in the blank with correct word.

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