Choose the answers to the questions:
1. What is the main function of the urinary system? 2. Why does the body excrete nitrogenous waste in the form of a soluble waste substance called urea? 3. Why can the kidneys be compared with the filters? 4. What does the production of diluted or concentrated urine depend upon? 5. What is urinalysis necessary for? 6. Why are ketone bodies quite dangerous if they accumulate in the body? 7. What does urinary bladder serve as? 8. What does renin stimulate? 9. Why is the specific gravity of urine low in kidney disease such as nephritis? 10. For what purpose are the kidneys in a cushion of adipose tissue?
- water balance;
- for determining the presence of abnormal elements;
- because water is unable to be reabsorbed by the tubules and this dilutes the wastes and minerals in the urine;
- for protection;
- because protein foods contain carbon, hydrogen, oxygen, nitrogen and other elements and the waste that is produced and cannot be excreted from the body simply by exhalation;
- as a temporary reservoir for urine;
- it stimulates the contraction of arterioles so that blood pressure is increased and blood flow in the kidneys is restored to normal;
- because their presence can increase the acidity of the blood, coma, unconsciousness may follow and a patient can die;
- because they perform the filtration of waste products from the blood;
- to remove urea from the bloodstream so that it does not accumulate in the body and become toxic.

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