Excretion in Human Beings
Excretion is the process by which waste products and harmful substances are removed from the body. In humans, excretion primarily occurs through the urinary system, which includes the kidneys, ureters, bladder, and urethra.

Kidneys
- The kidneys are the main organs responsible for excretion in humans.
- They filter waste products, excess ions, and water from the blood to form urine.
- The urine then flows through the ureters to the bladder.

Bladder
- The bladder stores urine until it is expelled from the body.
- When the bladder is full, a signal is sent to the brain, and the person feels the urge to urinate.

Urethra
- The urethra is a tube that connects the bladder to the outside of the body.
- When a person urinates, urine is expelled through the urethra.

Diagram of Excretion in Humans
A labeled diagram of the human excretory system would show the kidneys filtering waste from the blood, the ureters carrying urine to the bladder, the bladder storing urine, and the urethra expelling urine from the body. This diagram would help visualize the process of excretion in humans and the organs involved in it.
In conclusion, excretion is a vital process in the human body that helps remove waste products and maintain the body's internal environment. The urinary system, consisting of the kidneys, ureters, bladder, and urethra, plays a crucial role in excretion in humans.