Question

match each stage of sleep to the brain waves that dominate brain activity at that stage.
stage 1
choose
stage 2
choose
stages 3 and 4
choose

question 5
0.2 pts
why is rem sleep sometimes referred to as \paradoxical sleep\? (select all that apply)
□ lack of muscle tone
□ high brain activity
□ people do not dream during rem sleep
□ people are prone to sleepwalking during rem sleep

Explanation:

For the sleep stage-brain wave matching:

1. Stage 1 sleep, the lightest sleep stage, is dominated by theta waves, which are slower than waking alpha waves but faster than deeper sleep waves.
2. Stage 2 sleep is marked by sleep spindles and K-complexes, with theta waves still dominant but interrupted by these specific brain wave patterns.
3. Stages 3 and 4 (deep sleep) are dominated by slow, high-amplitude delta waves.

For the REM sleep question:

• REM sleep is called paradoxical because the brain shows high, wake-like activity, but the body has almost no muscle tone (atonia), creating a contradictory state of active brain and inactive body. Dreaming occurs during REM sleep, and sleepwalking happens in deep sleep (stages 3-4), not REM.

Answer:

Sleep Stage-Brain Wave Matching:

Stage 1: Theta waves
Stage 2: Theta waves (with sleep spindles/K-complexes)
Stages 3 and 4: Delta waves

Question 5:

• lack of muscle tone
• high brain activity