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Parts of the Excretory System

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The excretory system plays a vital role in ridding the body of extraneous wastes and toxins. The excretory system is made up of various internal organs that work together to detoxify the body.

The Skin
The skin is responsible for producing sweat, which helps regulate the salt concentration in the body. When you sweat, the salt helps evaporate the water and, in turn, cools off the body.

The Liver
The liver is part of the digestion system, but also plays a role in the excretory system. The liver has a small organelle called a peroxisome, which is responsible for taking high levels of toxicity and converting them to less toxic substances. Bile is a waste product in this process and is used in the digestive process.

The Kidneys
The role of the kidneys is to remove nitrogenous wastes from the body. Nitrogenous means that it is rich in the element nitrogen. Nitrogen in high concentrations in the body can cause several problems such as joint pain, strokes or heart attacks. The kidney is made up three parts: the renal cortex, the renal medulla and the renal pelvis. All mammals have two kidneys. The kidney's primary function is to regulate various body fluids and salt concentration.

The Other Parts of the Excretory System
The excretory system also contains the ureter, which are two tubes that lead into the bladder. The bladder holds unnecessary wastes for storage. The urethra is where urine is expelled from the body.

Blood is filtered through the kidneys by first traveling through the renal artery. The artery splits into many arterioles, which go to Bowman's Capsules that contain a bundle of capillaries called nephrons. The nephrons create a large bundle of capillaries called the glomerulus that filters the blood by taking out the toxins. Some toxins that are removed are ammonia, uric acid, medicines and antibiotics. This is also the site for reabsorbing amino acids, vitamins and water.

The renal pelvis takes the urine away from the ureter and stores it into the bladder. The bladder can expand as more liquid is stored. When full, the bladder sends nerves impulses to the brain and causes the sensation of being full. Urine is the liquid nitrogenous waste from the kidneys and is taken from the body through the urethra.

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    Anatomy - Excretory System

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    Parts of the Excretory System |
    Parts of the Excretory System. The excretory system plays a vital role in ridding the body of extraneous wastes and toxins. The excretory system is made up of various internal organs that work together to detoxify the body.


    Filtration - Excretory - Excretion - Kidneys - Bladder

United States

Overall, the excretory system acts in order to maintain a healthy fluid environment within animals. It works in order to remove nitrogenous wastes such as ammonia (which is a highly toxic compound). Due to the fact that osmoregulation is structurally and functionally linked in many animals, the process of osmoregulation will also be included. Osmoregulation is the general process by which animals control solute concentrations and balance water ga

Excretory/Urinary System
United States

Information on how humans and other animals excrete liquid waste.

United States

Offers a simple explanation on how toxins are removed from the body.

Overview Of The Excretory System, An
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Human Body Excretory System
United States

The excretory system is in charge of getting rid of bodily wastes and excess water. Jobs of the excretory system: Maintain volume of extracellular (outside the cells) fluid Maintain ionic balance in extracellular fluid Maintain pH and osmotic concentration of the extracellular fluid. Excrete toxic by-products such as urea, ammonia, and uric acid. Parts of the excretory system: Kidneys: Within each kidney are an estimated one mill

On-Line Biology Book: The Excretory System
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Description and diagrams. The Excretory System
Trinidad and Tobago

The excretory system is responsible for removing unwanted waste products from the body's chemistry. Generally speaking, excretion is the process of separating wastes from the body's fluids and eliminating them. Examples include the removal of carbon dioxide in the air we exhale, and unwanted nitrogen in sweat, nails and hair. (Don't confuse excretion with defecation. Defecation is getting rid of undigested foods from the body... via the colon.)

TED Case Studies: Bear Parts Trade
United States
Introductory Anatomy: Excretory and Reproductive Systems
United Kingdom

Explains how the systems are anatomically and evolutionarily linked.

Cytoskeletal System
United States

Slide show to accompany graduate-level lectures by Gwen V. Childs, at Little Rock, AR.