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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

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Excretory System

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  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

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