standardized argument

ORIGINAL:
Original

Standardized:
1. Muscle reaction depends on speed brain cells give commands to muscles.

2. An exercised brain may spot decaying insulation quicker and signal for repair cells to get to work.

3. Healthy myelin (a special sheet of fat that coats nerve fibres) allows prompt conduction of the electrical signals the brain uses to send commands.

4. Researchers conducted test to discover the ages where finger tapping speed started to decrease. Each subject was tested for myelin health in the areas necessary for the finger tap.

5. Myelin health as well as tap speed was at its best at age 39 for the group tested.

6. Rest of brain isn’t affected. In fact evidence shows that myelin in higher level thinking parts of the brain start to decay up to a decade later.

7. Building memories requires high-frequency electrical bursts, and Bartzokis' earlier research suggests an Alzheimer's-linked gene may eliminate myelin repair.

8. With age comes a weakening of the system that's supposed to repair broken myelin.

Therefore

9. As you age past 40, your brain and body start to slow.