During REM sleep,

A) breathing rate and heart rate are low and stable.
B) the muscles are tense and active.
C) brain activity is at a minimum.
D) dreams are most likely to occur.

Brain Activity

The electrical and metabolic phenomena occurring within the brain that are associated with functional operations and processes.

Muscles

Tissues in the body that have the ability to contract, enabling movement and force generation within the body.

Breathing Rate

The number of breaths taken per minute, which can vary with physical exertion, health conditions, stress, and other factors.