The Excretory SystemDavid Wu

Friday, 19 July 13

Overview of the Excretory System

• The excretory system plays a vital role in keeping the organism’s homeostasis.

• the excretory system is in charge of terminating liquid and gaseous waste product, as urine, sweat and exhalation.

Friday, 19 July 13

Liver

• The kidneys create an extremely strong bile. the bile is a toxic that breaks down fats eliminating all the waste. The liver converts the dangerous ammonia into “urea” a harmless fluid. It is also the largest gland in the body.

Friday, 19 July 13

Kidneys

• Liquid waste is removed through the body via the kidneys. Blood that contains water, minerals and urea passes threw it. The kidney then filters all waste from the blood into urine, which is funneled into the bladder.

Friday, 19 July 13

Skin

• The skin is important to maintaining Homeostasis, the skin contains two types of sweat glands the Eccrine and Apocrine. Sweat dispels salt and waste minerals but also keeps the body cool through evaporation. The Eccrine Glands are

mainly found on the palms, sole of feet and the

forehead.

Friday, 19 July 13

Lungs

• The lungs are also parts of the excretory system they expel the waste gas carbon dioxide. When the blood returns from a circulation around the body it holds carbon dioxide the waste from cells after the the oxygen is used. The gas is released through the mouth as respiration.

Friday, 19 July 13

Bladder

• The Bladder is the tank that holds up 600ml of urine. When urine goes to the bladder the muscles relax to hold it, at the toilet though the muscle contract and release.

Friday, 19 July 13

Substances

• Urine: A the waste created from liquids. Created from the livers powerful bile that breaks down fat which is then filtered by the kidneys released through the urethra.

• Sweat: The minerals excreted through the eccrine and apocrine of the skin, mainly salt but also other wastes.

• Carbon Dioxide: A gas that is produced when the cells in the human body uses all the oxygen leaving only Carbon Dioxide, released by the lungs to nose or mouth (known as respiration).

Friday, 19 July 13

Cirrhosis of the Liver

• Damage done to the liver usually due to Alcoholism, Hepatitis B and Hepatitis C. Cirrhosis cause the regenerative tissue in the liver to become damaged by lumps, the lumps then renders the liver useless. This is leads to high blood pressure. Currently there is no medical cure/drug the only way is to remove the affected area or a liver transplant.

Friday, 19 July 13