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86. Which stage of sleep is characterized by delta waves (very high amplitude and very low frequency)?

(A) Stage 4 sleep
(B) Stage 3 sleep
(C) Stage 2 sleep
(D) Stage1sleep
(E) REM sleep

User Jmserra
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Final answer:

Stage 3 sleep is the sleep stage characterized by low frequency, high amplitude delta waves, making it difficult to wake a person from this deep sleep.

Step-by-step explanation:

The stage of sleep characterized by delta waves, which are very high amplitude and very low frequency brain waves, is Stage 3 sleep. These delta waves have the lowest frequency, less than 3 Hz, and the highest amplitude of our sleeping brain wave patterns.

During Stage 3 sleep, also known as deep sleep or slow-wave sleep, an individual's heart rate and respiration slow down significantly, and waking the person from sleep is quite difficult.

User Nobs
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