Answer:
They're not dangerous they're just valveless venous structures that connect to the skull bones and are a crucial part of the brain to funcion with some sort of infection thing im not really sure, but long story short, dont damage them its bad
Explanation:
<span>Answer to your quesiton is C.Stimulant. stimulants increase activity of the body, they can be pleasurable and invigorating, also they can produce physcological affects on the sympathetic nervous system. many drugs are stimulants. so answer to your question is Nicotine is a stimulant that speeds up neural activity by increasing the body's production of epinephrine</span>
Your muscules send messages to your brain through nervous system example when your injured
