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excretory system

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Samridhi S.

on 9 January 2013

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Transcript of excretory system

Excretory system The impure blood goes to the kidneys. Once the blood enters the kidneys, it is pumped up into the nephrons, tiny structures which filter the blood. Cleaned blood is sent out from the renal vein(vein that carries the blood purified by the kidney), returning to the heart for circulation to the rest of the body, while waste products drain to the bladder through the ureters. You excrete... Excretion of urine sweat The bladder's primary function is to keep the urine in a place that is water tight without letting the urea and the waste products be reabsorbed into the body until the individual can find time to empty the bladder. A whole sequence of events occurs when the bladder has filled and a signal is sent to the brain that there's been filling.The first step is that the brain has signalled that the bladder is full, and the urethra,will then relax, and allow opening then the bladder will contract,expelling urine from the body. Excretion of sweat Your body works best when its temperature is about 98.6ºF (37ºC). When your body gets hotter than that, your brain doesn't like it — it wants your body to stay cool and comfortable. So the part of your brain that controls temperature, called the hypothalamus,sends a message to your body, telling it to sweat.Then special glands in your skin called sweat glands start making sweat. Sweat is also known as perspiration and it is made almost completely of water, with tiny amounts of other chemicals like ammonia urea, salts, and sugar. The sweat leaves your skin through tiny holes called pores. When the sweat hits the air, the air makes it evaporate (this means it turns from a liquid to a vapor). As the sweat evaporates off your skin, you cool down. Urine goes through the urethra to the bladder. Excretion of carbon dioxide When oxygen gets absorbed in the body,carbon dioxide is formed which is carried by veins to the heart, and then the heart pumps it to the lungs. Small air sacs (alveoli) in the lungs remove the carbon dioxide from the blood and it is exhaled. Excretory system is made up of organs which help in removal of the waste products from our body. The urethra is a muscular organ that enables the passage of urine to the outside.When the brain senses that the bladder is full, it sends message to the urethral muscles to open. Urine-kidneys
Carbon dioxide-lungs Systems that work with the excretory system Respitory system
Circulatory system
Digestive system Other types of excretions Tears
Feces(poop) Made by: Samridhi Facts about the.... 2. The skin acts as a sponge for oxygen. 3.An estimated 7,850,000,000,000 gallons of fluid passes through the bladder and out through the urethra in the average person's lifetime. 1. The bladder is as big as your brain. 4. As you urinate, your bladder starts to shrink only to grow larger when it fills with urine. 5. The Vein that leads to your kidneys is the biggest in the body. NOW WE PRESENT YOU.........:D If you thought it was…......... 98.4 F or 37C If you guessed it is kidneys…… If you thought it was….sweat If you think it is alveoli If not you still are…. …then you are… Urine
Carbon dioxide
tears If you thought it was …… If not you still are…. …then you are… If not you still are…. …then you are… If not you still are…. …then you are… If you think it is carbon dioxide….. If not you still are…. …then you are… If not you still are…. …then you are… Congratulations! You completed your first test!!! Test Time!!!
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