The excretory system

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The excretory system

Excretion:The process by which animals rid themselves of waste products and of the nitrogenous by-products of metabolism. Through excretion organisms control osmotic pressure-the balance between inorganic ions and water-and maintain acid-base balance.

Liver:The liver is responsible for detoxifying and breaking down any toxins such as chemicals and poisons that enter our bodies. One of the ways in which the liver fulfills this function is by taking ammonia in its poisonous form and converting it into urea which the kidney will eventually filter, creating urine. In addition, the liver produces bile which the body then uses to help break fats down into unusable waste and usable fats. Bile is stored in a person’s gall bladder after the liver produces it. The small intestine uses it to break down acidic wastes such as ammonia as well as fats and ethanol, converting them into harmless substances.The liver also serves several functions within the circulatory system. It is also responsible for maintaining the body’s proper levels of glucose based on cues from insulin (which increases the amount of glucose stored) and glucagon (which decreases the amount of glucose stored). The liver also helps detoxify the blood by removing any chemicals that are potentially hazardous.

Excretory System:CrashCourse Biolody #29

The Excretory System

Excretory Process:Function(

Cool Facts:*Kidneys receive 20-25% of all the blood pumped by the heart*The body's total blood supply circulates throught he kidneys at about 12 times per hour*Kidneys filter about 200 quarts of blood a day*Kidneys make up .5% of the body's total weight*Healthy kidneys work 24/7 to clean the blood*Each day 50 gallons of blood are filtered through 140 tubes and millions of filters within the kidneys

Lungs:Cellular respiration is necessary to provide our bodies with energy as without it, the body’s cells will die. However, cellular respiration produces the waste product of carbon dioxide which then needs to be eliminated from the system. This carbon dioxide diffuses out from the cells in the body, entering the bloodstream and eventually going to the lungs. The lungs contain alveoli which diffuse the carbon dioxide from the blood so it can enter the lung tissue and eventually leave the body during exhalation.

Kidneys:The kidneys excrete urine into one of the ureters. The kidneys serve a variety of functions including regulating blood pressure, maintaining the body’s acid-base balance and regulating electrolytes. They also naturally filter the blood, diverting the waste towards the urinary bladder. When the kidneys produce urine, they excrete wastes including ammonium and urea. Other functions include producing hormones and reabsorbing amino acids, glucose and water.

Skin:Sweat is a crucial part of the excretory system as it is responsible for eliminating sweat from the body. Salt contains several metabolic wastes including urea, salts and water. In addition to excreting metabolic wastes, sweat also cools down the body. The sweat glands are able to receive the various wastes because they are mixed in with capillaries, which are tiny blood vessels. This means that the wastes can diffuse out of the blood and enter the sweat glands before passing out of the skin in the form of sweat.

Structure of theKidneys:Diagram of the individual parts that make up the Kidneys.

Nephron Functions:Nephron is the basic structural and functional unit of the kidney. Its chief function is to regulate the concentration of water and soluble substances like sodium salts by filtering the blood, reabsorbing what is needed and excreting the rest as urine.

Difference between Filtration and Reabsorption:Filtration is the process whereby (usually passive) transport is triggered through the 'push' of blood flow and pressure. Reabsorption occurs more commonly within the nephron system than filtration, this is a form of active transport which takes the the useful substances for the body from the tubules and places them back into the blood filled capillaries.



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