The urine test report of a person shows the presence of free haemoglobin in urine, indicating that the red blood cells have been lysed.The part of nephron that MOST LIKELY shows malfunctioning in the given situation is
Correct answer: D. Proximal convoluted tubule
- A. Glomerulus
- B. Loop of Henle
- C. Collecting duct
- D. Proximal convoluted tubule
Explanation
The presence of free hemoglobin in urine suggests that hemoglobin is not being properly reabsorbed or processed by the nephron. The proximal convoluted tubule is responsible for reabsorbing the majority of substances from the filtrate, including proteins like hemoglobin. If this part of the nephron is malfunctioning, it can lead to the presence of free hemoglobin in urine. The glomerulus is responsible for filtering blood, but it does not reabsorb hemoglobin. The loop of Henle and the collecting duct are primarily involved in concentrating urine, not in processing hemoglobin.
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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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