EXCRETORY SYSTEM

Excretion Excretion is the process of removing

metabolic waste. Types of Cells: Podocytes, Endothelial, and

Mesangial (all found in enthrones) Organs: Lungs, Kidneys, and Skin Tissues: Exocrine Glandular Tissue-

Produces secretions such as sweat and mucus

Importance The Excretory System is important

because it removes waste from the body that can be dangerous

As a whole, it helps maintain homeostasis within other organisms and is responsible for removing waste products of metabolism

Epidermis

The epidermis is the outer surface layer of cells of a plant or animal

Roles of Organs Kidneys- primary excretory organs of the

body. They also play an important role in maintaining homeostasis of body fluid.

Lungs:- primary site of carbon dioxide excretion. The lungs carry out detoxification. This changes the harmful substances so that they are not poisonous.

Skin- helps kidneys control the salt composition of the blood. Waste and other substances are excreted through perspiration.

Roles (cont.)

Kidneys

Kidneys are the main organs of the urinary system and regulates the chemical composition of the body and the excretion of water dissolving waste.

Kidneys (cont.)

The structure of the kidney has three main parts:The renal cortexThe renal medullaThe renal pelvis

Urine and Urea

Muscular contractions of the bladder force urine out of the body through a tube called the urethra.

Urea is a nitrogenous product made by the liver.

Nephron Urine is made in structures called nephron,

which are tiny tubes in the kidney. Bowman’s capsule: retains cells and large

molecules and passes wastes dissolved in water through the nephron

Inside each Bowman’s capsule a network of capillaries called glomerous is formed

Nutrients travel through the nephron and are absorbed in the bloodstream

Circulatory System The circulatory is made up of the

cardiovascular system and lymphatic system

Systematic circulation is the movement of blood between the heart and rest of the body. It supplies blood to the kidneys where wastes are filtered and removed.

Peristalsis

Peristalsis is the series of muscular contractions through the digestive tract

Bile

Bile is a bitter-tasting dark green fluid. It helps the digestion of lipids in the

small intestine It is produced in the liver of most

vertebrates

Duodenum

Duodenum is the first section of the small intestine

It is responsible for the breakdown of food in the small intestine with help from enzymes

It also regulates the rate of emptying the stomach using the hormonal pathways

Kidney Disorder

Alcoholism- destroys the balance of ions and water in the body by altering the filtering ability of the kidney.

Additional Information

The liver produces 6,500 ounces of bile in the average persons lifetime

The vein that leads to your kidney is the longest in the body

Kidneys also produce vitamin D which promotes strong bones and keeps blood pressure at a healthy level

Bibliography http://www.clccharter.org/donna/medschool

/systems/system%20research/excretory/excretory.htm

http://scienceray.com/biology/human-biology/human-body-the-excretory-system/

http://www.comprehensive-kidney-facts.com/excretory-system.html

http://www.medindia.net/know_ur_body/anatomy-of-urinary-system.asp

http://www.fi.edu/learn/heart/systems/excretion.html