Biology News
Department of Chemistry and Biochemistry Invests in System to Recycle a Precious Resource, Helium - University of Arkansas Newswire


University of Arkansas Newswire
The Department of Chemistry and Biochemistry in the J. William Fulbright College of Arts and Sciences recently installed a liquid helium recovery system. Wesley Stites, the department's chair, said the investment for the system cost about $250,000, but ...

New system can identify drugs to target 'undruggable' enzymes critical in many diseases - Science Daily


Science Daily
Scientists from the Medical Research Council (MRC) Laboratory of Molecular Biology, in Cambridge, UK, demonstrated the capabilities of the new system by identifying a molecule that could successfully target a phosphatase to reduce the accumulation of ...

New Human Evolution Theory: We Won Not Because of Smarts but Because of Versatility - Haaretz


Haaretz
The evidence for any theory of human evolution is scanty in the extreme. The Denisovans are known from a handful of peripheral bones, we don't know completely where Neanderthals really ranged or when (or why) they died out – and the less confidently ...

Human Body Excretory System

Monroe County, New York - 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 million microscopic nephrons. Filtering of the blood takes place within these areas. Each nephron contains a cluster of capillaries called a glomerulus. A cup-shaped sac called a Bowman's capsule surrounds each glomerolus. The blood that flows through the glomerulus is under great pressure. This causes glomerulus, water, glucose and urea to enter the Bowman's capsule. White blood cells, red blood cells and proteins remains in the blood. As the blood continues through the blood vessels, it winds around the renal tubule. During this time, reabsorption occurs. Glucose and chemicals, such as potassium, sodium, hydrogen magnesium and calcium are reabsorbed into the blood. Almost all the water removed during filtration returns to the blood during the reabsorption phase. The kidneys control the amount of liquid in our bodies. Now only wastes are in the nephron. These wastes are called urine and include urea, water and inorganic salts. The cleansed blood goes into veins that carry the blood from the kidneys and back to the heart.

Ureters:
Ureters are muscular ducts that propel urine from the kidneys to the urinary bladder. In the adult, the ureters are usually 2530 cm (1012 in) long.

Urethra:
A tube that carries urine from the bladder to the outside of the body.

Bladder:
The urinary bladder is the organ that collects urine excreted by the kidneys prior to disposal by urination. It is a hollow muscular, and elastic organ, and sits on the pelvic floor. Urine enters the bladder via the ureters and exits via the urethra.

Skin:
Gives off bodily sweat or perspiration. Skin is the largest organ of the human body. It also protects the inner organs and tissues of the body.

Lungs:
Lungs give off carbon dioxide, a bodily waste, during respiration.

Related
Human Body: Endocrine System
Turkey

The endocrine system is made up of a group of glands that produce the body's long-distance messengers, or hormones. The endocrine system is instrumental in regulating mood, growth and development, tissue function, and metabolism, as well as sexual function and reproductive processes. The endocrine system is an information signal system much like the nervous system. However, the nervous system uses nerves to conduct information, whereas the end

Human Body's Skeletal System Theme Page
Canada

Links to sites with information about the human skeletal system.

Gray's Anatomy of the Human Body: The Lymphatic System
United States

Details the system's development and components.

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
United States
Parts of the Excretory System
United States

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,

On-Line Biology Book: The Excretory System
United States

Description and diagrams.

Comprehensive-kidney-facts.com: 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.)