Presentation on theme: "Heterotrophic Nutrition Organisms that obtain food are heterotrophs Ingestion- Taking in food Digestion- Breaking down food 2 Types: 1. Intracellular."— Presentation transcript:
Organisms that obtain food are heterotrophs Ingestion- Taking in food Digestion- Breaking down food 2 Types: 1. Intracellular digestion- digestion inside a single cell (unicellular organisms) 2. Extracellular digestion- digestion within a system (multi-cellular organisms). Ex) Inside the stomach and small intestine Egestion- Removal of undigested food (solid wastes)
Mechanical vs. Chemical Digestion Mechanical Digestion- Physical breakdown (teeth cut, tear, grind, and chew food in mouth) – Also occurs in stomach – provides large surface area for chemical digestion! Chemical Digestion a.k.a Enzymatic Hydrolysis- Chemical breakdown with water and enzymes. With enzymes, organic compounds like carbs, proteins, and lipids are broken into their USABLE NUTRIENTS!
Human Nutrition Nutrition- Those activities by which organisms obtain and process nutrients Nutrients- Usable parts of food Nutrients Absorbed without digestion: Vitamins Minerals Water
Six Main Nutrients Absorbed without digestion: Water Vitamins Minerals Absorbed with digestion: Carbs. glucose Proteins amino acids Lipids glycerol & fatty acids
Malfunctions of the Digestive System Heartburn Gastric juice enters esophagus Treat with medicine Gallstones Hardened Cholesterol
Ulcers open sores inside of stomach Treated with antacids, diet, surgery.
Appendicitis Inflammation of Appendix. Can be removed
Constipation- Difficulty with egestion because too much water is reabsorbed by L.I. Diarrhea- Causes dehydration, not enough water is reabsorbed by L.I.
Indicators: Indicate the presence of a substance in a mixture pH Paper/Litmus Paper: Indicates pH Blue Benedict’s Solution: Indicates presence of monosaccharides (glucose) Color Change Blue Orange/Red must heat
Lugol’s Iodine Solution: Indicates polysaccharides (starch) Color Change Brown Blue/Black Unglazed Paper: Indicates lipids Turns translucent (clear)