1 / 9

Excretory System

Excretory System . Excretion involves the removal of wastes that pass through a membrane or wastes that are results of metabolic processes. (Undigested food that is eliminated is NOT excreted.) Kidney : excretion of nitrogenous wastes, excess water, salts, and spices

shel
Télécharger la présentation

Excretory System

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Excretory System Excretion involves the removal of wastes that pass through a membrane or wastes that are results of metabolic processes. (Undigested food that is eliminated is NOT excreted.) Kidney: excretion of nitrogenous wastes, excess water, salts, and spices Lungs: carbon dioxide, spices, and water Skin: water and salts

  2. Urinary System Kidneys: main organs of the urinary system that regulate the excretion of water, solutes, and nitrogenous wastes.

  3. Parts of the Kidney • Cortex: outermost portion (1/3) • Medulla: inner 2/3 of the kidney • Renal pelvis: funnel-shaped structure in the center of the kidney where the renal vein and renal artery meet the kidney • Nephrons: functional units of kidneys where urine is formed

  4. In the Nephron • Bowman’s capsule: cup-shaped structure enclosing a bed of capillaries where filtration occurs • Glomerulus: capillary bed that receives blood from the renal artery • Renal tubule: further exchange of materials occur here in the processes of reabsorption and secretion • Loop of Henle: part of the renal tubule that ensures the reabsorption of water

  5. Formation and Composition of Urine • From the renal tubules of nephrons urine collects • Urine is composed of urea, salts, water, and other metabolic wastes • Nitrogenous wastes are in the form of ammonia (toxic) which the liver converts to urea. Thus, the liver contributes to both digestion and excretion.

  6. Elimination of Urine • Urine travels from the renal pelvis through a narrow tube called a ureter. • It is then stored in the urinary bladder. • Elimination occurs when urine is forced through the urethra

More Related