Question

the sleep stage at which muscles begin to contract and relax is _______
a. stage 1
b. stage 2
c. stage 3
d. stage 4

please select the best answer from the choices provided

a
b
c
d

Explanation:

Identify the physiological characteristics of sleep stage 2

During stage 2 sleep (a period of light sleep before entering deep sleep), the body transitions into a more relaxed state. This stage is characterized by a decrease in body temperature, a slower heart rate, and muscles that begin to rhythmically contract and relax.

Match with the given options

The description "muscles begin to contract and relax" corresponds to stage 2 sleep, which is option B.

Answer:

• A. stage 1
• B. stage 2 (Correct answer)
• C. stage 3
• D. stage 4