Urinalysis (100% Verified Answers)

What is the filter of the kidney? correct answers Glomerulus Approximately how many mLs of plasma are filtered by the kidneys each minute? correct answers 120 mL What occurs in the tubules? correct answers Substances important to the body are reabsorbed from urine back into bloodstream. Define renal threshold. correct answers The plasma concentration at which active transport stops. What happens when renal threshold is reached? correct answers The kidney has reabsorbed as much as it can, and excess substance is secreted into the urine. What exceeds its renal threshold in diabetes mellitus? correct answers Glucose What is tubular secretion? correct answers Passage of substances from blood into tubular filtrate. This is how waste products and foreign substances are eliminated. What role does tubular secretion play in acid-base balance? correct answers Secretion and elimination of H+ ions Where does final concentration of urine occur? correct answers Late distal convoluted tubule & collecting duct ** What role does ADH play in urine concentration? correct answers Renders the walls of the distal tubule & collecting duct permeable to water. ** Concentration of urine depends on what hormone? correct answers ADH ** In a dehydrated state, what happens to the levels of ADH being produced? correct answers Increase so that more water is reabsorbed ** What determines levels of ADH? correct answers Hydration state of body ** Define oliguria. correct answers Decreased urine output When is oliguria seen? correct answers States of dehydration -- vomiting, diarrhea, sweating, severe burns, etc. ** Define anuria. correct answers Complete cessation of urine flow -- may result from any serious damage to kidneys or from a decrease in renal blood flow ** Define polyuria. correct answers Increased daily urine output (more than 3 L per day)