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Excretory system


excretory system

excretory system

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  • 1. EXCRETORY SYSTEM Celeste R. Desingaño
  • 2. Excretory System
    • Consists of 2 kidneys, 2 ureters, urinary bladder and urethra
    • Essential in the removal of wastes from the body
  • 3. Parts of the Excretory System
    • 1. Kidneys
    • The bean-shaped organs found just above the waistline
    • Renal Fascia
    • This is the thin fibrous layer, which anchors the kidney to the surrounding structures to maintain the normal position of the organ.
  • 4. The Work of the Kidneys
    • The work of the kidney is to separate urine from the blood which flows through it.
    • Kidney plays a role in regulating the composition of the plasma by extracting excess wastes and other substances into the urine.
    • Each kidney receives the renal artery directly from the dorsal aorta and are drained by the renal veins which pass to the postcaval vein.
  • 5. The Work of the Kidney
    • Three Processes:
    • 1. Filtration
    • The blood plasma is filtered through the walls of the glomerulus and collects in the Bowman’s capsule
    • This process forms a fluid, the nephric filtrate , which contains all the ions and small molecules present in the blood plasma.
  • 6. The Work of the Kidney
    • Three Processes:
    • 2. Tubular reabsorption
    • The nephric filtrate passes through the tubular parts of the nephron where very large quantities of water and smaller quantities of glucose and other useful compounds are saved and reabsorbed.
    • This process of selective reabsorption demands that the gland cells in the tubule wall transfer the reabsorbed compounds back into the blood through the capillaries surrounding the tubule.
  • 7. The Work of the Kidney
    • Three Processes:
    • 3. Tubular secretion
    • The nephric tubules secrete additional quantities of metabolic wastes into the nephric filtrate
    • Waste are extracted from the capillaries around the tubule and passed into the lumen of the nephron.
    • Reabsorption and secretion greatly change the composition of the nephric filtrate as this fluid drains through the nephron toward the collecting tubules.
    • The fluid as it reaches the collecting tubule contain a number of amber colored liquid with metabolic waste called urine
  • 8. Excretory System
    • 2. Ureters
    • These are two tubes which function to convey urine from the kidneys to the bladder.
    • Passes from the pelvis to the posterior aspect of the urinary bladder
    • Peristalsis begins at the renal pelvis and ending at the bladder.
  • 9. Parts of the Excretory System
    • 3. Urinary Bladder
    • This sac lies posterior to the pubis.
    • Separated from the rectum by the seminal vesicles in the male and by the vagina and uterus in the female.
    • Serves as reservoir for urine, gradually fills and becomes distended
    • Peritoneum
    • Covering of the superior surface of the bladder.
  • 10. Parts of Excretory System
    • 4. Urethra
    • This is where urine is expelled.
  • 11.
    • 1. Skin
    • Excretes wastes, secretes fluid and make possible growth and repair of hair cells.
    • Through sweating, the skin excretes excess salt, water and other metabolic wastes in the form of perspiration through pores
    • 2. Large intestine
    • 12-24 hours are required for the waste products of digestion to pass through the colon and rectum.
    Other Excretory Organ
  • 12.
    • 3. Lungs
    • Excreting CO 2
    • 4. Liver
    • Produces bile which is concentrated by the removal of water and salts.
    Other Excretory Organ