How does exercise affect the nerve system

The immediate effects of exercise are on the neurotransmitters. They cause the signals that pass through the brain go faster. This makes it easier for you to learn new things. Since exercise makes muscles stronger, cells are created in the process and it increases the number of pathways for oxygen and other things. That makes your reflexes and your nerves faster. Different types of exercises also increase your cognitive learning. 

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D. contract and relax