Question

The four structures listed are part of the human excretory system.​

I. Bladder​

II. Kidney​

III. Ureter​

IV. Urethra​

In which order does a molecule of urea pass through these structures?​

Answer 1

(d) ​

​Kidneys filter blood, then the ureters carry urine from the kidneys to the bladder. Urine is stored in the urinary bladder till a voluntary signal from CNS carries out its release through urethra.​