190 likes | 243 Views
THE EXCRETORY SYSTEM. Controlling the Internal Environment. HW #3-14. Read pages 275 – 279 (middle) 1. What are the 3 water compartments in the body? 2. What are the jobs of your kidneys? 3. What is the most important waste excreted by the kidneys?. HW #3-15.
E N D
THE EXCRETORY SYSTEM Controlling the Internal Environment
HW #3-14 • Read pages 275 – 279 (middle) 1. What are the 3 water compartments in the body? 2. What are the jobs of your kidneys? 3. What is the most important waste excreted by the kidneys?
HW #3-15 • Read page 279(middle) – 285 (middle) • 1. How does a protist excrete wastes? An earthworm? • 2. What is the function of each of these organs: kidney, ureter, bladder, urethra? • 3. What do the nephrons do?
Gross Anatomy of System • Two kidneys • Two ureters • Urinary bladder • Urethra
The Kidney Papilla Pyramid Cortex Medulla Hilum Column Calyx Pelvis Ureter
Functions of Excretory System • Regulate body fluids • Volume, pH, composition • Remove metabolic wastes from blood • Control rate of Red Blood Cell (RBC) formation • Regulate blood pressure • Regulate absorption of calcium
Nephron PCT Bowman’s capsule DCT Vasa recti Glomerulus Ascending tubule Descending Tubule Collecting duct
Function of Renal Corpuscle • Bowman’s capsule • Glomerulus • Filtration of blood • Water • Electrolytes • Glucose • Urea
Function of Tubules • Reabsorption of glucose • Proximal convoluted tubule • Reabsorption of water • PCT, descending tubule, collecting duct • Reabsorption of salts • PCT, ascending tubule, distal con. tub. • Reabsorption of urea • PCT, collecting duct