Insulin is a substance that protects, coats, and insulates neurons, connect impulses from one neuron to another. is this true or false?

False. Insulin is a type of chemical that is released within the other parts of the body. The brain is the only trigger or the thinking part of the body that inhibits this response. High insulin levels within the body may cause the diabetes and can be prevented through regular physical activity and proper diet. 

Well if you pick a machine to work on and that's gonna be your exercise if you don't stick to that machine your muscle strength your muscle mass rather will change because you haven't been doing it you change something in your exercise routine which changes your body's form of dealing with things for example you might become weaker or stronger depending on what kind of exercises you do in whether or not the machine you picked actually your muscles grow.