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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.
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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.
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 cortex • The renal medulla • The 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
