Excretory System
Published on Nov 25, 2015
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PRESENTATION OUTLINE
EXCRETORY SYSTEM
BY ANDERSON KIM, JARED HERNANDEZ, JACOB CAPDEVILA
System Function
The excretory system is a passive biological system that removes excess, unnecessary or dangerous materials from an organism, so as to help maintain homeostasis within the organism and prevent damage to the body. It is responsible for the elimination of the waste products of metabolism as well as other liquid and gaseous wastes. As most healthy functioning organs produce metabolic and other wastes, the entire organism depends on the function of the system; however, only the organs specifically for the excretion process are considered a part of the excretory system.
What makes up the Excretory system?
Ureter: urine enters the ureters, two muscular tubes that move the urine by peristalsis to the bladder.
Bladder: The bladder is a hollow, sac-like organ that stores urine. When the bladder is about half full, it sends a nerve impulse to a sphincter to relax and let urine flow out of the bladder and into the urethra.
Urethra: The urethra is a muscular tube that carries urine out of the body.
Kidneys: The kidneys are a pair of bean-shaped organs just above the waist. The function of the kidney is to filter blood and form urine.
Liver:
The liver detoxifies and breaks down chemicals, poisons and other toxins that enter the body. For example, the liver transforms ammonia (which is poisonous) into urea (which is then filtered by the kidney into urine). The liver also produces bile, and the body uses bile to breakdown fats into usable fats and unusable waste.
Large intestine :
The large intestine collects waste from throughout the body. It extracts any remaining usable water and then removes solid waste. At about 10 feet long, it transports the wastes through the tubes to be excreted.
Photo by Albaraa Mehdar
Skin:
Skin excretes sweat through sweat glands throughout the body. This helps to remove additional wastes, such as excess urine. Furthermore, the sweat, helped by salt, evaporates and helps to keep the body cool when it is warm.
Photo by Great Beyond
Function of your kidneys!
Your kidneys are complex organs. They regulate the amount of water lost from the body and get rid of waste products, especially urea. Urea is made when any excess amino acids are broken down in your liver. The amino acids come from protein you have eaten.
About 180 litres of water filters through your kidneys every day, but only about 1.5 litres finally leaves your body as urine. This makes it so that homeostasis is achieved in the body by the kidneys.
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http://youtu.be/TZMJeZL-BVg
A VIDEO
Where and how the kidney functions.
Nephrons are made up of long, parallel tubes and blood vessels, and are the functional units of the kidney, doing the work of filtering, cleaning and regulating blood, producing urine, and synthesizing hormones. At the beginning of the nephron, the glomerulus is a network of capillaries that performs the first step of filtering blood. The Bowman's capsule is an expansion at the closed end of a renal tubule. A kidney's renal corpuscle is composed of tangled clusters of blood capillaries, called a glomerulus, and a thin-walled, saclike structure called the Bowman's capsule, which surrounds the glomerulus.
Photo by scribbletaylor
