In addition to water, sweat contains mainly
Correct answer: D. mineral salts and a little urea
- A. glucose and protein
- B. urea and hormones
- C. amino acids and fats
- D. mineral salts and a little urea
Explanation
Sweat is mostly water with dissolved salts and traces of urea, so sweating causes both water and salt loss that must be replaced. It is a cooling mechanism first and an excretory route second.
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About Kidney and Urinary System
The kidney and urinary system remove nitrogenous wastes, regulate water and ion balance, and help maintain blood pH through filtration, selective reabsorption and secretion. Questions cover nephron structure, ultrafiltration, the loop of Henle, collecting ducts, urine formation and the roles of ADH and aldosterone, while distinguishing excretion from egestion.
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