Alex and Nathan go to the gym.
Hey Alex lets go to the gym
Lets play a pickup game.
Yeah let's get started.
Good work out dude. I'd better go home I'm sore/tired.
Yeah me too.
The nervous system/brain isn't sending much signals to the muscular system but it will during and after the workout.
The nervous system/brain is telling the skeletal muscles to move the skeleton to run, due to all that moving and running the body's muscles tissues are tearing up.
The nervous system is sensing the muscles tearing, now is sending signals to the muscular system to heal and repair all of the torn/broken muscle tissues like the cardiac muscles and make them stronger this time.
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