I'm not sure, but I think that its your skin that protects the internal tissues.
2 major loops - one goes from the heart to the lungs while the other from the heart to the other parts of your body
<span>All cardiovascular diseases are caused by poor lifestyle choices is false. While it may be true that causes of cardiovascular diseases are poor lifestyle such as smoking, alcohol and poor diet. Not all can arise from this.
</span>Hormones are <span>chemicals secreted and regulated by the endocrine system is true. Hormones are chemicals which help the body function properly and of course, maintained by our endocrine system.</span>
