Digestive System

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Digestive System

Created 3 years ago

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  1. Review of Basic Chemistry:

    Slide 1 - Review of Basic Chemistry:

  2. The Digestive System

    Slide 4 - The Digestive System

  3. All living and nonliving matter is composed of 92 naturally-occurring basic elements (Periodic Table)

    Slide 5 - All living and nonliving matter is composed of 92 naturally-occurring basic elements (Periodic Table)

    • Six elements (C, H, N, O, P, S) make up 98% of living things.
  4. Elements and Compounds

    Slide 6 - Elements and Compounds

    • When two or more different elements bond together, they form a compound (e.g., H2O).
    • A molecule is the smallest part of a compound that has the properties of the compound.
    • One glass of water has TRILLIONS of water molecules (7.5 x 1024)
    • One Water Molecule:
  5. What is the MOST IMPORTANT nutrient for all living things?

    Slide 7 - What is the MOST IMPORTANT nutrient for all living things?

  6. Slide 8

    • WATER’S IMPORTANCE:
    • -All living things are made up of at least 70% water.
    • -Water is liquid between 0 C and 100 C which is critical for life.
  7.  Four Properties of Water

    Slide 9 - Four Properties of Water

    • 1. The temperature of liquid water rises and falls more slowly than that of most other liquids. This protects living things from rapid temperature changes and helps them maintain normal temperatures.
    • Arctic Ocean Coastline: Winter (left), Summer (right).
  8. 2.  When animals sweat, evaporation of the sweat takes away body heat, thus cooling the animal.

    Slide 10 - 2. When animals sweat, evaporation of the sweat takes away body heat, thus cooling the animal.

  9. Slide 11

    • 3. Water is universal solvent, because it dissolves a great number of solutes. Water helps transport substances in the body (blood is mostly water), as well as dilute toxins.
    • Solvents dissolve other substances .
  10. 4.  Hydrogen bonds create surface tension.  This allows some insects to walk on water.  Hydrogen bonds also allow ice to float on liquid water.

    Slide 12 - 4. Hydrogen bonds create surface tension. This allows some insects to walk on water. Hydrogen bonds also allow ice to float on liquid water.

  11. What is the pH Scale?

    Slide 13 - What is the pH Scale?

    • pH is a measure of how acidic or basic a substance is.
    • It is based on a 14-point scale.
    • water has a neutral pH of 7
    • An acid is a substance with pH less than 7;
    • A base is a substance with pH greater than 7.
    • * Buffers keep pH steady and within normal limits in living organisms..
  12. “Normal” pH?

    Slide 14 - “Normal” pH?

    • Most living things prefer a neutral pH (around 7)
    • There are exceptions
    • Strong acids (and bases) can cause damage to the body.
    • Teeth
    • Stomach
  13. Anatomy of the Mouth

    Slide 15 - Anatomy of the Mouth

  14. How Cavities Form:

    Slide 16 - How Cavities Form:

    • Bacteria in mouth feed on sugars 
    • Bacteria release ACIDS as waste 
    • Acid dissolves away enamel 
    • CAVITY
  15. Where Else in the Body is Acid NORMALLY Found?

    Slide 17 - Where Else in the Body is Acid NORMALLY Found?

    • Stomach acid helps in the physical breakdown of food (into smaller pieces)
    • More importantly, stomach acid kills most harmful bacteria that might be found in food (and could make you sick)
  16. Disorders of the Digestive System

    Slide 18 - Disorders of the Digestive System

    • GERD
    • Gastroesophageal reflux disease
    • Stomach acid  esophagus  heart burn
  17. Slide 19

    • GOOD JOB!