The glomerulus is a cluster of capillaries in the kidney that filters blood to remove waste and extra water. The filtered waste and water are then excreted from the body in urine.
Bowman's capsule is a cup-shaped sac in the kidney that filters blood to create urine. It's part of the nephron, which is the filtration structure in the kidney.
Selective reabsorption of useful substances occurs in the proximal convoluted tubule, the loop of Henle and the collecting duct. The loop of Henle is a U-shaped tubule in the kidney's medulla that reabsorbs water and salt from the filtrate.
The urethra's main function is to allow urine to pass out of the body. It also allows semen to pass through in males.
There is an explanation video available below.
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