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Excretory System
Responsible for removing waste products and excess substances from the body to maintain internal balance (homeostasis).
Kidneys
Filter blood to remove waste (such as urea), excess water, and salts, forming urine.
Ureters
Tubes that transport urine from the kidneys to the bladder.
Bladder
Stores urine until it is ready to be expelled.
Urethra
Carries urine from the bladder out of the body.
Liver
Processes toxins and waste products.
Lungs
Excrete carbon dioxide and water vapor.
Skin
Removes waste through sweat.
Nephrons
Functional units in the kidneys that filter blood.
Renal Artery
Supplies oxygenated blood to the kidneys.
Renal Vein
Carries filtered blood away from the kidneys.
Filtration
Blood is filtered in the kidneys (specifically in the nephrons) to remove waste, excess water, and toxins.
Reabsorption
Essential substances like water, glucose, and ions are reabsorbed into the bloodstream to maintain balance.
Secretion
Additional waste products and excess ions are actively transported from the blood into the urine.
Storage
Urine is temporarily stored in the bladder until it is ready to be excreted.
Excretion
Urine is expelled from the body through the urethra, removing metabolic waste.
Urea
A nitrogen-containing waste product formed in the liver from the breakdown of proteins and excreted by the kidneys in urine.
Carbon Dioxide (CO₂)
A waste gas produced during cellular respiration and expelled from the body through the lungs.
Nitrogenous Waste
Waste products containing nitrogen, such as urea, uric acid, and ammonia, which result from the metabolism of proteins and nucleic acids.
Waste
Unwanted or excess substances produced by the body’s metabolic processes that need to be excreted to maintain homeostasis.
