systems topics

The nervous system is the system that alert you when you are hurt or feel something.The nervous system helps a lot by sending singles to the brain and the brain sends cells to heal the damage part it also connects the spinal cord.for example you have an itch the nervous system alert you of the itch if you scratch it you will feel another thing which is pain you're body will be relief for a moment until the nervous system alerts you.

The muscular system is made up of tissue and softer bones.Muscles are relaxed when digesting substance or food. Muscles also protect weaker bones in the body such as the skull, knee, and fingers

Muscles also evolve with you like for example you turn 13 you grown muscle and hurt and what you feel sometimes growing pains. Growing pains occur when your body is grown.