The age at which infants first exhibit the classic sleep stages seen in adults is ____ months.

The age at which infants first exhibit the classic sleep stages seen in adults is ____ months.
 
  a. 6 c. 12
  b. 9 d. 18

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Q. 2  Sleep spindles occur at a frequency of ____ cycles/s.
 
  a. 4 to 7 c. 14 to 16
  b. 9 to 13 d. <3.5

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Q. 3  Which characteristics are associated with REM sleep?
 
  1. Lower level tonic activity
  2. High-voltage, low-frequency waves on an electroencephalogram
  3. Absence of tonic activity on an electromyogram
  4. Often absent responsiveness to external stimuli
  a. 1 and 2 c. 1, 2, and 4
  b. 3 and 4 d. 2, 3, and 4

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Q. 4  Which of the following brain waveforms are present during wakefulness? 1. Alpha waves 2. Beta waves 3. Relatively low-voltage, mixed-frequency waves 4. Delta waves
 
  a. 1 and 2 c. 3 and 4
  b. 2 and 3 d. 1, 2, and 4

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Q. 5  Which of the following will not cause a respiratory acidosis?
 
  a. Diabetes mellitus c. Overdose with sed-atives
  b. Neuromuscular dis-order d. Restrictive pulmo-nary disease

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Q. 6  What is the correct interpretation of the following arterial blood gas values: pH of 7.38, PaCO2 of 38 mm Hg, and HCO3 of 23 mEq/L?
 
  a. Normal c. Respiratory acidosis
  b. Respiratory alkalo-sis d. Metabolic acidosis