The 650 skeletal muscles in the human body contract when they receive signals from motor neurons, which are triggered from a part of the cell called the sarcoplasmic reticulum. Motor neurons tell your muscles to contract and the better you become at having those signals tell your muscles to contract, the stronger you can get.
CANCER, DIABETES, AND IMMUNE SYSTEM diseases are diseases that are considered non-infectious. Non-infectious diseases are diseases that are caused by surrounded factors, lifestyle factors, environmental toxins, and etc.
Or is this a multiple choice question? If it is, what are the choices?
Answer: Public health measures such as pure food and water, and development of immunizations against many serious diseases such as polio and smallpox, coupled with enhanced economic conditions, are together credited with substantial reductions in the burden of infectious diseases.
I believe that it would be A.It's a natural part of our everyday lives, even though some stress can be beneficial but not in large amounts