1 / 13

Excretory System

Excretory System. Functions. removes dangerous , unnecessary, or excess materials from the body allows the body to maintain homeostasis (stable internal environment). A. Important Organs. Skin: excretes sweat (excess water, salts, and urea)

casta
Download Presentation

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

  2. Functions • removes dangerous, unnecessary, or excess materials from the body • allows the body to maintain homeostasis (stable internal environment)

  3. A. Important Organs • Skin: excretes sweat (excess water, salts, and urea) • Urea: toxic compound (amino acids  energy) • Lungs: excretes CO2 (cellular respiration)

  4. Liver: breaks down toxins (ammonia urea) • Maintains blood glucose levels • Large intestine: reabsorbs water and excretes waste

  5. Kidneys: remove waste from blood, maintain blood pH, regulate H2O content of blood • Ureter: tube that carries urine from kidney to bladder • Bladder: where urine is stored before being excreted • Urethra: tube through which urine is excreted

  6. B. Nephron • Filtration: renal artery brings waste-filled blood to the kidneys • In the glomerulus (capillaries), water and dissolved particles (filtrate) are pulled out of the blood into the Bowman’s capsule • filtrate: water, salts, urea, glucose, amino acids, vitamins

  7. Reabsorption: in proximal tubule, water and nutrients are reabsorbed by the capillaries • Loop of Henle: urine is concentrated and water is conserved • 99% of water is reabsorbed

  8. Secretion: in the distal tubule, wastes that were not initially filtered out are removed from the blood • Collecting duct: filtrate, now called urine, is emptied here • Renal vein returns purified blood to body

More Related