Excretory system
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Excretory system

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excretory system

excretory system

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    Excretory system Excretory system Presentation Transcript

    • EXCRETORY SYSTEM Celeste R. Desingaño
    • Excretory System
      • Consists of 2 kidneys, 2 ureters, urinary bladder and urethra
      • Essential in the removal of wastes from the body
    • 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.
    • 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.
    • 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.
    • 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.
    • 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
    • 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.
    • 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.
    • Parts of Excretory System
      • 4. Urethra
      • This is where urine is expelled.
      • 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
      • 3. Lungs
      • Excreting CO 2
      • 4. Liver
      • Produces bile which is concentrated by the removal of water and salts.
      Other Excretory Organ