Select the most appropriate option to fill in blank number 2.
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. increases.
During REM sleep, physical indicators such as blood pressure and heart rate tend to rise compared to other sleep stages.
This makes 'increases' the best fit.
'Stables' is incorrect as it is not grammatically accurate (the correct word would be 'stabilizes'). Blood pressure is not stable during REM sleep.
'Relaxes' doesn’t match the physiological state during REM.
'Beeps' is unrelated to the context.