Identify the 5 parts of the central nervous system please

brain and spinal cord

Explanation: if you're actually refering to the csn it has just those 2 parts

the more fit you are, the faster the recovery. your heart rate drops most sharply in the first minute after you stop exercising; it should then fall about 20 beats a minute—a drop of less than 12 beats a minute is considered abnormal. this “recovery heart rate” is measured as part of an exercise stress test.