Hand-in worksheet on the Excretory/Urinary System

KEY CONCEPT The excretory system removes wastes and helps maintain homeostasis.

The excretory system eliminates nonsolid wastes from the body. Nonsolid wastes are eliminated through lungs, skin, and kidneys. Lungs exhale carbon dioxide and water vapor. Sweat glands in skin release excess water and salts. Kidneys filter and clean the blood to produce urine. skin lungs kidneys ureters urinary bladder urethra

Kidneys have three basic functions in maintaining homeostasis. remove waste from blood help to maintain electrolyte, pH, and fluid balances release key hormones

The kidneys help to maintain homeostasis by filtering the blood. cortex medulla renal artery renal vein ureter (to bladder) Kidneys are a pair of bean-shaped organs. two layers: medulla and cortex filtering units called nephrons renal artery and renal vein

Nephrons clean the blood and produce urine. 4. Glomerulus-filters and cleans the blood 5. Bowman’s Capsule-holds the filtrate, molecules are reabsorbed into the capillaries to balance the blood chemically 6. Loop of Henle- Water is reabsorbed. 7. Collecting ducts- collect urine from nephrons and send it to the ureter. from body to body to body loop of Henle from other nephrons

Nephrons clean the blood and produce urine. Nephrons are the filtering units in the kidneys. They clean and rebalance the blood to produce urine. from body to body to body loop of Henle from other nephrons

Nephrons clean the blood in a three-step process. The first step is filtration of the blood. FILTRATION Water,electrolytes,aminoacids,glucose,urea, and other small molecules diffuse out of the blood,creating the filtrate. 1 Glomerulus Bowman’s capsule

The first step is filtration of the blood. The second step is reabsorption of materials. The third step is excretion of materials. REABSORPTION As the filtrate enters the rest of the tubule ,most of the materials are reabsorbed into the blood.Materials not reabsorbed make up the urine,which flows into the loop of Henle. 2 from body collecting duct EXCRETION In the loop of Henle,water can be reabsorbed one final time to reduce the volume of urine.The remaining urine flows into a collecting duct that leads to the ureter. 3 to body from other nephrons loop of Henle

Injury and disease can damage kidney functions. A kidney transplant can replaced damaged kidney. recipient and donor tissue must match drugs prevent tissue rejection The daughter and son in this photo donated a kidney and liver tissue to their mother.

1st-finish lab analysis 2nd-collect research from Fri. 3rd-finish handout on Excretory system 4th – new work handout “The Urinary System” TEST WED.

Dialysis can be used to filter and clean the blood.