Final answer:
The crucial organs of the excretory system include the kidneys, ureters, bladder, and urethra. The kidneys filter the blood to remove waste and excess substances, forming urine. The ureters transport the urine to the bladder for storage until it is excreted through the urethra.
Step-by-step explanation:
The excretory system plays a crucial role in the body by eliminating wastes and thus maintaining bodily homeostasis. The main organs that perform critical functions in the excretory system are the kidneys, ureters, urinary bladder, and urethra.
The kidneys are the central organ in the excretory system. They filter the blood and purify it by removing waste substances and excess substances. This filtration involves specialized cells known as nephrons which work in three steps: filtration, reabsorption, and secretion.
Once filtered in the kidneys, the waste, now termed as urine travels down through the ureters and gets stored in the urinary bladder until it is ready to be excreted. The urethra serves as the passage for the urine to exit the body.
Whilst the liver and lungs do play a role in waste management, for the purpose of this answer we are focusing on the urinary excretory system.
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