Answer: urethra.
- A urethra
- B ureter
- C oesophagus
- D bile duct
Correct answer: A. urethra
Explanation: Urine passes from the bladder out of the body through the urethra.
Filtrate flows through four functionally distinct stages of the nephron: Bowman's capsule filters blood, the PCT reabsorbs most useful substances unconditionally, the Loop of Henle builds a concentration gradient via counter-current exchange, the DCT secretes selected substances, and the collecting duct performs the final ADH-controlled water reabsorption.
Concept context
Nitrogenous waste, kidney structure, urine formation in the nephron, and hormonal regulation of excretion.
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