Biology : The excretory system
Excretory Organ Waste excreted substance Chemical excreted
Kidneys Nitrogenous waste Urine Water
Non-nitrogenous Salts
waste Urea
Uric acid
Creatinine
Lungs CO2 product of Exhaled air CO2 and water
cellular respiration
Skin Helps maintain body Sweat Water
temperature( secretio Salts
n =sweat) Urea
creatinine
Gut/Colon Into small intestine faeces bile pigments
=defaecication Cholesterol
* Liver Not an excretory Bile pigments Bile pigments broken
organ down from
Urea= excess amino haemoglobin
Many waste products acids
formed in liver
Nitrogenous waste
Non-nitrogenous
waste
, The Urinary System
-maintains homeostasis
Structure Function
Inferior Vena Cava Carries purified deoxy blood to heart
Kidneys Filter nitrogenous waste out of blood
Regulate water/salt balance(osmoregulatory)
Aorta Carries oxy blood with nitrogenous waste to
the body cells
Motor nerve Stimulates contraction of bladder wall
Sphincter muscle Controls flow of urine
urethra Carries urine to exterior
bladder Stores urine
ureter Carries urine to bladder
Renal vein Carries purified blood to inferior Vena Cava
Renal artery Carries oxygen and nitrogenous waste to
kidney
*Renal gland Secrets aldosterone( role in urine formation)
The Kidney
Excretory Organ Waste excreted substance Chemical excreted
Kidneys Nitrogenous waste Urine Water
Non-nitrogenous Salts
waste Urea
Uric acid
Creatinine
Lungs CO2 product of Exhaled air CO2 and water
cellular respiration
Skin Helps maintain body Sweat Water
temperature( secretio Salts
n =sweat) Urea
creatinine
Gut/Colon Into small intestine faeces bile pigments
=defaecication Cholesterol
* Liver Not an excretory Bile pigments Bile pigments broken
organ down from
Urea= excess amino haemoglobin
Many waste products acids
formed in liver
Nitrogenous waste
Non-nitrogenous
waste
, The Urinary System
-maintains homeostasis
Structure Function
Inferior Vena Cava Carries purified deoxy blood to heart
Kidneys Filter nitrogenous waste out of blood
Regulate water/salt balance(osmoregulatory)
Aorta Carries oxy blood with nitrogenous waste to
the body cells
Motor nerve Stimulates contraction of bladder wall
Sphincter muscle Controls flow of urine
urethra Carries urine to exterior
bladder Stores urine
ureter Carries urine to bladder
Renal vein Carries purified blood to inferior Vena Cava
Renal artery Carries oxygen and nitrogenous waste to
kidney
*Renal gland Secrets aldosterone( role in urine formation)
The Kidney
