A "tract system" refers to a method of dividing land or property into smaller pieces called tracts. Each tract is a separate piece of land that can be bought or sold individually, usually for different purposes, such as building homes or farming.
Oddly enough, among other things, both are linked to cancer in the urinary tract system. (second-opinion-doc.com)
Their respiratory tract system can also be affected with allergies. (dogbreedz.com)
Females are more likely to develop UTIs than males as bacteria are much more easily able to enter their urinary tract systems through their much wider and shorter urethras. (pethealthnetwork.com)