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4chapter38
 

4chapter38

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    4chapter38 4chapter38 Presentation Transcript

    • Digestive and Excretory Systems By Daria Tugwell
    • The Process of Digestion The Mouth:
      • Where the digestive system begins
      • Begins process of mechanical digestion
      • Digestive enzymes break down food molecules
    • The Esophagus and Stomach
      • Tongue and Throat push bolus down into esophagus
      • Food from esophagus put into the stomach, a muscular sac
      • Pepsin and hydrochloric acid used to start protein digestion process
      • Stomach produces chyme
    • The Pancreas and Liver
      • Pancreas; a gland with three functions
      • Produce hormones
      • Produces enzymes
      • And produces sodium bicarbonate
      • Liver produces bile that makes enzymes break down fat molecules
    • Small and Large Intestine
      • Chyme goes into jejunm and ileum
      • SMALL INTESTINE-
      • Huge surface area and nutrient-free
      • LARGE INTESTINE-
      • Main job is to remove water from the undigested material
    • The Excretory System The Kidneys:
      • 2 Main organs of excratory system
      • Blood goes into kidney through renal artery
      • Waste products are collected as urine
      • The filtered blood is returned to the cycle
    • Kidney Structure
      • Inner: Renal medulla
      • Outer: Renal cortex
      • Nephron: Functional unit
      • About 1 million in each kidney
    • Filtration and Reabsorption
      • Filtration: Glomerulus and Bowman’s capsule help nephron filter
      • Reabsorption: Most material goes back into blood
      • *Kidneys filter blood every 45 minutes
    • Control of Kidney Function
      • Important for homeostasis
      • It regulates water content in blood