What occurs physiologically during REM sleep?
a. Growth hormone is secreted.
b. Metabolic needs are decreased.
c. Sympathetic nervous system predominates.
d. Heart rate and blood pressure decrease.
C
The sympathetic nervous system predominates during REM sleep. Oxygen consumption increases, and cardiac output, blood pressure, heart rate, and respiratory rate may become erratic. NREM sleep is dominated by parasympathetic nervous system. Blood pressure, heart and respiratory rates, and the metabolic rate return to basal levels. About 80% of total daily growth stimulating hormone is released in NREM sleep.
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