The Excretory System of the Human Body

The Excretory Sy= stem of the Human Body

The Excretory System Functions:

1. Collect water and filter body flui= ds

2. Remove extra waste products from b= ody fluid

3. Return other necessary substances = to the body fluids

4. Eliminate the excretory waste prod= ucts from the body

The Excretory System (excretion) is a group of organs that work together to perform a function for the body. The job of the excretory system is = to filter extra fluid and substances from the blood stream. The waste fluid and substances are= passed out of the body as urine. What would you look like if your body did not get rid of the extra fluid? What would happen to your body if = the harmful substances were not removed from your body?

The kidneys can be found behind your intestines. Blood passes through the kidneys 3= 00 times a day. The nephrons cle= an the blood in 45 minutes. Six cups= of urine are sent to the bladder everyday as the kidneys filter waste out of t= he blood. Your cells make waste materials which are carried by the blood to the kidneys to be filtered. Nephrons in the kidneys are the millions of tiny filters that remove the waste which combines with excess water to make urine.&= nbsp; The urine goes through the = ureter to a storage sac called the bladde= r. When the bladder fills, a message = is sent to the brain and you feel the need to go to the bathroom. The urine leaves the bladder throu= gh the urethra and out of your body.<= span style=3D'mso-spacerun:yes'> The kidneys, bladder and tubes are called the urinary system.

The Urine is 95% water. Two tablespoons is a chemical substance called urea formed in the liver which c= an also be found in your saliva and sweat.&nb= sp; Salt, pigment (color) molecules, poisons, and other chemicals make up the rest of the urine. The co= lor of urine comes from bile. Rememb= er the digestive system? Bile is mad= e in the liver and is stored in the gall bladder to aid the digestive system to break big fat molecules into smaller fat molecules. When bile breaks down, pigment mol= ecules are released. Some pigment molecules make solid waste brown and other pigment molecules (urichrome) ma= ke urine yellow. Why do wet baby diapers smell? When the urea = in urine begins to break down, ammonia and carbon dioxide are form. Ammonia (NH₃) has a str= ong odor. Do not leave those wet diapers on too long!

The excretory system= works with other body systems as we learned systems work together for a complete organism. The excretory, circulatory and endocrine system work together. We will learn = more about the endocrine system later. The endocrine system works closely with the excretory system releasi= ng hormones. The adrenal glands are found on the kidneys. The adrenals release adrenaline wh= ich is a hormone. The lungs, sweat g= land and the skins are also involved with the excretory system. Can you explain why?

Gout is a disorder in which humans accumulate more = than the usual amount of uric acid because the body manufacturing excess uric ac= id or the kidneys not excreting enough of it. It gets stored in the body, frequently in toe joints, causing pain and deformation of the joints involv= ed as well as the formation of kidney stones. People who had gout were put on diets low in purines.

Kidney Stones: In some cases, excess wastes crystallize as kidney stones. They grow and can become a painful irritant that may require surgery or ultrasound treatments. Some stones are small enough to be forced into the urethra, others are larger.