<span>I do not know that there has been any reason discovered for why men are more prone to have kidney stones than females. Some have suggested that diet may have something to do with this. A high protein and high salt diet make kidney stones more likely. Men tend to have a greater intake of both protein and salt. As women started following diets such as the South Beach diet or Adkins diet, the incidence of kidney stones has been increasing in women over the past 20 years. Obviously, there could be some contribution to female and male hormones, but this has never been proven.</span>
The circulatory system is system in the human body that provides a network through which our blood flows constantly.The human cardiovascular system is considered closed because there are no holes for blood to enter or leave the system. Correct answer: D
In the closed circulatory system the blood stays confined within the vessels and heart.