9. The metabolic rate while sleeping is __ than the basal metabolic rate. A) lower B) equal C) higher

## Step 1<br />The basal metabolic rate (BMR) is the amount of energy expended while at rest in a neutrally temperate environment, in the post-absorptive state (meaning that the digestive system is inactive, which requires about 12 hours of fasting in humans). Essentially, it is the amount of energy required to keep your body functioning at rest.<br />## Step 2<br />The metabolic rate during sleep is generally lower than the BMR. This is because the body's energy expenditure is reduced during sleep, as the body is at rest and not performing any physical activities.<br />## Step 3<br />Therefore, the metabolic rate while sleeping is lower than the basal metabolic rate.