Excretory system
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Excretory system

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Excretory system Excretory system Presentation Transcript

  • EXCRETORY SYSTEM
  • 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 System1. Kidneys The bean-shaped organs found just above the waistlineRenal 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 KidneyThree 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 KidneyThree 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 KidneyThree 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 System3. 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 distendedPeritoneum Covering of the superior surface of the bladder.
  • Parts of ExcretorySystem4. Urethra This is where urine is expelled.
  • Other Excretory Organ1. 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 pores2. 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 CO2 4. Liver  Produces bile which is concentrated by the removal of water and salts.